56151681 has 8 divisors (see below), whose sum is σ = 76892544. Its totient is φ = 36422640.

The previous prime is 56151637. The next prime is 56151701. The reversal of 56151681 is 18615165.

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

It is not a de Polignac number, because 56151681 - 2⁶ = 56151617 is a prime.

It is a super-2 number, since 2×56151681² = 6306022558251522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56151281) 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, 252825 + ... + 253046.

It is an arithmetic number, because the mean of its divisors is an integer number (9611568).

Almost surely, 2^56151681 is an apocalyptic number.

It is an amenable number.

56151681 is a deficient number, since it is larger than the sum of its proper divisors (20740863).

56151681 is a wasteful number, since it uses less digits than its factorization.

56151681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505911.

The product of its digits is 7200, while the sum is 33.

The square root of 56151681 is about 7493.4425333087. The cubic root of 56151681 is about 382.9313481470.

The spelling of 56151681 in words is "fifty-six million, one hundred fifty-one thousand, six hundred eighty-one".