126531869 has 4 divisors (see below), whose sum is σ = 128314080. Its totient is φ = 124749660.

The previous prime is 126531859. The next prime is 126531893. The reversal of 126531869 is 968135621.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126531869 is a prime.

It is a super-2 number, since 2×126531869² = 32020627745266322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126531859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 890999 + ... + 891140.

It is an arithmetic number, because the mean of its divisors is an integer number (32078520).

Almost surely, 2^126531869 is an apocalyptic number.

It is an amenable number.

126531869 is a deficient number, since it is larger than the sum of its proper divisors (1782211).

126531869 is an equidigital number, since it uses as much as digits as its factorization.

126531869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782210.

The product of its digits is 77760, while the sum is 41.

The square root of 126531869 is about 11248.6385398412. The cubic root of 126531869 is about 502.0342047983.

The spelling of 126531869 in words is "one hundred twenty-six million, five hundred thirty-one thousand, eight hundred sixty-nine".