307961681 has 8 divisors (see below), whose sum is σ = 330945120. Its totient is φ = 285519168.

The previous prime is 307961677. The next prime is 307961683. The reversal of 307961681 is 186169703.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 307961681 - 2² = 307961677 is a prime.

It is a super-2 number, since 2×307961681² = 189680793928691522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (307961683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134051 + ... + 136328.

It is an arithmetic number, because the mean of its divisors is an integer number (41368140).

Almost surely, 2^307961681 is an apocalyptic number.

It is an amenable number.

307961681 is a deficient number, since it is larger than the sum of its proper divisors (22983439).

307961681 is a wasteful number, since it uses less digits than its factorization.

307961681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270463.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 307961681 is about 17548.8370269941. The cubic root of 307961681 is about 675.3033339909.

The spelling of 307961681 in words is "three hundred seven million, nine hundred sixty-one thousand, six hundred eighty-one".