55417561 has 2 divisors, whose sum is σ = 55417562. Its totient is φ = 55417560.

The previous prime is 55417529. The next prime is 55417577. The reversal of 55417561 is 16571455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29975625 + 25441936 = 5475^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 55417561 - 2⁵ = 55417529 is a prime.

It is a super-2 number, since 2×55417561² = 6142212134377442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55417591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27708780 + 27708781.

It is an arithmetic number, because the mean of its divisors is an integer number (27708781).

Almost surely, 2^55417561 is an apocalyptic number.

It is an amenable number.

55417561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55417561 is an equidigital number, since it uses as much as digits as its factorization.

55417561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21000, while the sum is 34.

The square root of 55417561 is about 7444.2972133036. The cubic root of 55417561 is about 381.2552235780.

The spelling of 55417561 in words is "fifty-five million, four hundred seventeen thousand, five hundred sixty-one".