55277987 has 2 divisors, whose sum is σ = 55277988. Its totient is φ = 55277986.

The previous prime is 55277977. The next prime is 55278023. The reversal of 55277987 is 78977255.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55277987 - 2⁶ = 55277923 is a prime.

It is not a weakly prime, because it can be changed into another prime (55277977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27638993 + 27638994.

It is an arithmetic number, because the mean of its divisors is an integer number (27638994).

Almost surely, 2^55277987 is an apocalyptic number.

55277987 is a deficient number, since it is larger than the sum of its proper divisors (1).

55277987 is an equidigital number, since it uses as much as digits as its factorization.

55277987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1234800, while the sum is 50.

The square root of 55277987 is about 7434.9167446583. The cubic root of 55277987 is about 380.9348795549.

The spelling of 55277987 in words is "fifty-five million, two hundred seventy-seven thousand, nine hundred eighty-seven".