56837021 has 2 divisors, whose sum is σ = 56837022. Its totient is φ = 56837020.

The previous prime is 56836993. The next prime is 56837023. The reversal of 56837021 is 12073865.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56400100 + 436921 = 7510^2 + 661^2 .

It is a cyclic number.

It is not a de Polignac number, because 56837021 - 2⁶ = 56836957 is a prime.

Together with 56837023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56837023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28418510 + 28418511.

It is an arithmetic number, because the mean of its divisors is an integer number (28418511).

Almost surely, 2^56837021 is an apocalyptic number.

It is an amenable number.

56837021 is a deficient number, since it is larger than the sum of its proper divisors (1).

56837021 is an equidigital number, since it uses as much as digits as its factorization.

56837021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 56837021 is about 7539.0331608237. The cubic root of 56837021 is about 384.4829648111.

The spelling of 56837021 in words is "fifty-six million, eight hundred thirty-seven thousand, twenty-one".