55531657 has 2 divisors, whose sum is σ = 55531658. Its totient is φ = 55531656.

The previous prime is 55531649. The next prime is 55531681. The reversal of 55531657 is 75613555.

55531657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52359696 + 3171961 = 7236^2 + 1781^2 .

It is a cyclic number.

It is not a de Polignac number, because 55531657 - 2³ = 55531649 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55531457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765828 + 27765829.

It is an arithmetic number, because the mean of its divisors is an integer number (27765829).

Almost surely, 2^55531657 is an apocalyptic number.

It is an amenable number.

55531657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55531657 is an equidigital number, since it uses as much as digits as its factorization.

55531657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 78750, while the sum is 37.

The square root of 55531657 is about 7451.9565887088. The cubic root of 55531657 is about 381.5166923032.

The spelling of 55531657 in words is "fifty-five million, five hundred thirty-one thousand, six hundred fifty-seven".