56215837 has 2 divisors, whose sum is σ = 56215838. Its totient is φ = 56215836.

The previous prime is 56215801. The next prime is 56215867. The reversal of 56215837 is 73851265.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54081316 + 2134521 = 7354^2 + 1461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56215837 is a prime.

It is a super-2 number, since 2×56215837² = 6320440659221138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56215796 and 56215805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56215867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28107918 + 28107919.

It is an arithmetic number, because the mean of its divisors is an integer number (28107919).

Almost surely, 2^56215837 is an apocalyptic number.

It is an amenable number.

56215837 is a deficient number, since it is larger than the sum of its proper divisors (1).

56215837 is an equidigital number, since it uses as much as digits as its factorization.

56215837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 56215837 is about 7497.7221207511. The cubic root of 56215837 is about 383.0771318090.

The spelling of 56215837 in words is "fifty-six million, two hundred fifteen thousand, eight hundred thirty-seven".