56681641 has 4 divisors (see below), whose sum is σ = 56698884. Its totient is φ = 56664400.

The previous prime is 56681629. The next prime is 56681663. The reversal of 56681641 is 14618665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23088025 + 33593616 = 4805^2 + 5796^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56681641 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 56681641.

It is not an unprimeable number, because it can be changed into a prime (56681441) 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, 1990 + ... + 10831.

It is an arithmetic number, because the mean of its divisors is an integer number (14174721).

Almost surely, 2^56681641 is an apocalyptic number.

It is an amenable number.

56681641 is a deficient number, since it is larger than the sum of its proper divisors (17243).

56681641 is a wasteful number, since it uses less digits than its factorization.

56681641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17242.

The product of its digits is 34560, while the sum is 37.

The square root of 56681641 is about 7528.7210733298. The cubic root of 56681641 is about 384.1322809058.

The spelling of 56681641 in words is "fifty-six million, six hundred eighty-one thousand, six hundred forty-one".