56121977 has 2 divisors, whose sum is σ = 56121978. Its totient is φ = 56121976.

The previous prime is 56121973. The next prime is 56121983. The reversal of 56121977 is 77912165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31629376 + 24492601 = 5624^2 + 4949^2 .

It is a cyclic number.

It is not a de Polignac number, because 56121977 - 2² = 56121973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56121977.

It is not a weakly prime, because it can be changed into another prime (56121971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28060988 + 28060989.

It is an arithmetic number, because the mean of its divisors is an integer number (28060989).

Almost surely, 2^56121977 is an apocalyptic number.

It is an amenable number.

56121977 is a deficient number, since it is larger than the sum of its proper divisors (1).

56121977 is an equidigital number, since it uses as much as digits as its factorization.

56121977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26460, while the sum is 38.

The square root of 56121977 is about 7491.4602715359. The cubic root of 56121977 is about 382.8638132198.

The spelling of 56121977 in words is "fifty-six million, one hundred twenty-one thousand, nine hundred seventy-seven".