56921639029 has 2 divisors, whose sum is σ = 56921639030. Its totient is φ = 56921639028.

The previous prime is 56921639009. The next prime is 56921639051. The reversal of 56921639029 is 92093612965.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32178978225 + 24742660804 = 179385^2 + 157298^2 .

It is a cyclic number.

It is not a de Polignac number, because 56921639029 - 2³³ = 48331704437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56921639009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28460819514 + 28460819515.

It is an arithmetic number, because the mean of its divisors is an integer number (28460819515).

Almost surely, 2^56921639029 is an apocalyptic number.

It is an amenable number.

56921639029 is a deficient number, since it is larger than the sum of its proper divisors (1).

56921639029 is an equidigital number, since it uses as much as digits as its factorization.

56921639029 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 56921639029 in words is "fifty-six billion, nine hundred twenty-one million, six hundred thirty-nine thousand, twenty-nine".