55520977 has 2 divisors, whose sum is σ = 55520978. Its totient is φ = 55520976.

The previous prime is 55520939. The next prime is 55521001. The reversal of 55520977 is 77902555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 1218816 = 7369^2 + 1104^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55520977 is a prime.

It is not a weakly prime, because it can be changed into another prime (55520477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27760488 + 27760489.

It is an arithmetic number, because the mean of its divisors is an integer number (27760489).

Almost surely, 2^55520977 is an apocalyptic number.

It is an amenable number.

55520977 is a deficient number, since it is larger than the sum of its proper divisors (1).

55520977 is an equidigital number, since it uses as much as digits as its factorization.

55520977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110250, while the sum is 40.

The square root of 55520977 is about 7451.2399639255. The cubic root of 55520977 is about 381.4922326242.

The spelling of 55520977 in words is "fifty-five million, five hundred twenty thousand, nine hundred seventy-seven".