56621069 has 2 divisors, whose sum is σ = 56621070. Its totient is φ = 56621068.

The previous prime is 56621053. The next prime is 56621077. The reversal of 56621069 is 96012665.

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., 42745444 + 13875625 = 6538^2 + 3725^2 .

It is a cyclic number.

It is not a de Polignac number, because 56621069 - 2⁴ = 56621053 is a prime.

It is a super-2 number, since 2×56621069² = 6411890909405522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56621029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28310534 + 28310535.

It is an arithmetic number, because the mean of its divisors is an integer number (28310535).

Almost surely, 2^56621069 is an apocalyptic number.

It is an amenable number.

56621069 is a deficient number, since it is larger than the sum of its proper divisors (1).

56621069 is an equidigital number, since it uses as much as digits as its factorization.

56621069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 56621069 is about 7524.6972696581. The cubic root of 56621069 is about 383.9953997026.

The spelling of 56621069 in words is "fifty-six million, six hundred twenty-one thousand, sixty-nine".