56071681 has 4 divisors (see below), whose sum is σ = 56088000. Its totient is φ = 56055364.

The previous prime is 56071667. The next prime is 56071733. The reversal of 56071681 is 18617065.

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 56071681 - 2⁵ = 56071649 is a prime.

It is a super-2 number, since 2×56071681² = 6288066820331522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56071601) 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, 781 + ... + 10618.

It is an arithmetic number, because the mean of its divisors is an integer number (14022000).

Almost surely, 2^56071681 is an apocalyptic number.

It is an amenable number.

56071681 is a deficient number, since it is larger than the sum of its proper divisors (16319).

56071681 is a wasteful number, since it uses less digits than its factorization.

56071681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16318.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 56071681 is about 7488.1026301727. The cubic root of 56071681 is about 382.7494060259.

The spelling of 56071681 in words is "fifty-six million, seventy-one thousand, six hundred eighty-one".