55531577 has 2 divisors, whose sum is σ = 55531578. Its totient is φ = 55531576.

The previous prime is 55531529. The next prime is 55531579. The reversal of 55531577 is 77513555.

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., 43309561 + 12222016 = 6581^2 + 3496^2 .

It is a cyclic number.

It is not a de Polignac number, because 55531577 - 2⁶ = 55531513 is a prime.

Together with 55531579, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55531577.

It is not a weakly prime, because it can be changed into another prime (55531579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27765788 + 27765789.

It is an arithmetic number, because the mean of its divisors is an integer number (27765789).

Almost surely, 2^55531577 is an apocalyptic number.

It is an amenable number.

55531577 is a deficient number, since it is larger than the sum of its proper divisors (1).

55531577 is an equidigital number, since it uses as much as digits as its factorization.

55531577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 91875, while the sum is 38.

The square root of 55531577 is about 7451.9512209890. The cubic root of 55531577 is about 381.5165090963.

The spelling of 55531577 in words is "fifty-five million, five hundred thirty-one thousand, five hundred seventy-seven".