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126813601 = 823154087
BaseRepresentation
bin1111000111100…
…00010110100001
322211121210120001
413203300112201
5224431013401
620330020001
73066616645
oct743602641
9284553501
10126813601
1165645a32
1236577601
1320371345
1412bb0c25
15b1ee601
hex78f05a1

126813601 has 4 divisors (see below), whose sum is σ = 126968512. Its totient is φ = 126658692.

The previous prime is 126813569. The next prime is 126813613. The reversal of 126813601 is 106318621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 106318621 = 467227663.

It is a cyclic number.

It is not a de Polignac number, because 126813601 - 25 = 126813569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126813601.

It is not an unprimeable number, because it can be changed into a prime (126813641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76221 + ... + 77866.

It is an arithmetic number, because the mean of its divisors is an integer number (31742128).

Almost surely, 2126813601 is an apocalyptic number.

It is an amenable number.

126813601 is a deficient number, since it is larger than the sum of its proper divisors (154911).

126813601 is an equidigital number, since it uses as much as digits as its factorization.

126813601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154910.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 126813601 is about 11261.1545145247. The cubic root of 126813601 is about 502.4065332789.

The spelling of 126813601 in words is "one hundred twenty-six million, eight hundred thirteen thousand, six hundred one".

Divisors: 1 823 154087 126813601