56149721 has 2 divisors, whose sum is σ = 56149722. Its totient is φ = 56149720.

The previous prime is 56149699. The next prime is 56149727. The reversal of 56149721 is 12794165.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55294096 + 855625 = 7436^2 + 925^2 .

It is a cyclic number.

It is not a de Polignac number, because 56149721 - 2¹⁸ = 55887577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56149727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28074860 + 28074861.

It is an arithmetic number, because the mean of its divisors is an integer number (28074861).

Almost surely, 2^56149721 is an apocalyptic number.

It is an amenable number.

56149721 is a deficient number, since it is larger than the sum of its proper divisors (1).

56149721 is an equidigital number, since it uses as much as digits as its factorization.

56149721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 35.

The square root of 56149721 is about 7493.3117511552. The cubic root of 56149721 is about 382.9268926308.

The spelling of 56149721 in words is "fifty-six million, one hundred forty-nine thousand, seven hundred twenty-one".