55523561 has 2 divisors, whose sum is σ = 55523562. Its totient is φ = 55523560.

The previous prime is 55523549. The next prime is 55523563. The reversal of 55523561 is 16532555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29767936 + 25755625 = 5456^2 + 5075^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55523561 is a prime.

It is a super-2 number, since 2×55523561² = 6165731652241442, which contains 22 as substring.

Together with 55523563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55523563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27761780 + 27761781.

It is an arithmetic number, because the mean of its divisors is an integer number (27761781).

Almost surely, 2^55523561 is an apocalyptic number.

It is an amenable number.

55523561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55523561 is an equidigital number, since it uses as much as digits as its factorization.

55523561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22500, while the sum is 32.

The square root of 55523561 is about 7451.4133558675. The cubic root of 55523561 is about 381.4981508716.

The spelling of 55523561 in words is "fifty-five million, five hundred twenty-three thousand, five hundred sixty-one".