145836681 has 4 divisors (see below), whose sum is σ = 194448912. Its totient is φ = 97224452.

The previous prime is 145836673. The next prime is 145836683. The reversal of 145836681 is 186638541.

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 not a de Polignac number, because 145836681 - 2³ = 145836673 is a prime.

It is a super-2 number, since 2×145836681² = 42536675050191522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145836683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24306111 + ... + 24306116.

It is an arithmetic number, because the mean of its divisors is an integer number (48612228).

Almost surely, 2^145836681 is an apocalyptic number.

It is an amenable number.

145836681 is a deficient number, since it is larger than the sum of its proper divisors (48612231).

145836681 is an equidigital number, since it uses as much as digits as its factorization.

145836681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48612230.

The product of its digits is 138240, while the sum is 42.

The square root of 145836681 is about 12076.2858942640. The cubic root of 145836681 is about 526.3673274056.

The spelling of 145836681 in words is "one hundred forty-five million, eight hundred thirty-six thousand, six hundred eighty-one".