55277977 has 2 divisors, whose sum is σ = 55277978. Its totient is φ = 55277976.

The previous prime is 55277941. The next prime is 55277987. The reversal of 55277977 is 77977255.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50851161 + 4426816 = 7131^2 + 2104^2 .

It is a cyclic number.

It is not a de Polignac number, because 55277977 - 2²³ = 46889369 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55277977.

It is not a weakly prime, because it can be changed into another prime (55277987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638988 + 27638989.

It is an arithmetic number, because the mean of its divisors is an integer number (27638989).

Almost surely, 2^55277977 is an apocalyptic number.

It is an amenable number.

55277977 is a deficient number, since it is larger than the sum of its proper divisors (1).

55277977 is an equidigital number, since it uses as much as digits as its factorization.

55277977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080450, while the sum is 49.

The square root of 55277977 is about 7434.9160721558. The cubic root of 55277977 is about 380.9348565840.

The spelling of 55277977 in words is "fifty-five million, two hundred seventy-seven thousand, nine hundred seventy-seven".