56721359 has 2 divisors, whose sum is σ = 56721360. Its totient is φ = 56721358.

The previous prime is 56721331. The next prime is 56721389. The reversal of 56721359 is 95312765.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56721359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56721389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28360679 + 28360680.

It is an arithmetic number, because the mean of its divisors is an integer number (28360680).

Almost surely, 2^56721359 is an apocalyptic number.

56721359 is a deficient number, since it is larger than the sum of its proper divisors (1).

56721359 is an equidigital number, since it uses as much as digits as its factorization.

56721359 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 38.

The square root of 56721359 is about 7531.3583768136. The cubic root of 56721359 is about 384.2219831058.

The spelling of 56721359 in words is "fifty-six million, seven hundred twenty-one thousand, three hundred fifty-nine".