55977121 has 2 divisors, whose sum is σ = 55977122. Its totient is φ = 55977120.

The previous prime is 55977113. The next prime is 55977127. The reversal of 55977121 is 12177955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43296400 + 12680721 = 6580^2 + 3561^2 .

It is a cyclic number.

It is not a de Polignac number, because 55977121 - 2³ = 55977113 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55977127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27988560 + 27988561.

It is an arithmetic number, because the mean of its divisors is an integer number (27988561).

Almost surely, 2^55977121 is an apocalyptic number.

It is an amenable number.

55977121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55977121 is an equidigital number, since it uses as much as digits as its factorization.

55977121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22050, while the sum is 37.

The square root of 55977121 is about 7481.7859498919. The cubic root of 55977121 is about 382.5341271329.

The spelling of 55977121 in words is "fifty-five million, nine hundred seventy-seven thousand, one hundred twenty-one".