56912279521 has 2 divisors, whose sum is σ = 56912279522. Its totient is φ = 56912279520.

The previous prime is 56912279503. The next prime is 56912279537. The reversal of 56912279521 is 12597221965.

56912279521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38064010000 + 18848269521 = 195100^2 + 137289^2 .

It is a cyclic number.

It is not a de Polignac number, because 56912279521 - 2¹³ = 56912271329 is a prime.

It is not a weakly prime, because it can be changed into another prime (56912279581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28456139760 + 28456139761.

It is an arithmetic number, because the mean of its divisors is an integer number (28456139761).

Almost surely, 2^56912279521 is an apocalyptic number.

It is an amenable number.

56912279521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56912279521 is an equidigital number, since it uses as much as digits as its factorization.

56912279521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 49.

The spelling of 56912279521 in words is "fifty-six billion, nine hundred twelve million, two hundred seventy-nine thousand, five hundred twenty-one".