55561169 has 4 divisors (see below), whose sum is σ = 57976896. Its totient is φ = 53145444.

The previous prime is 55561159. The next prime is 55561171. The reversal of 55561169 is 96116555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55561169 is a prime.

It is a super-2 number, since 2×55561169² = 6174087001293122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55561139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207829 + ... + 1207874.

It is an arithmetic number, because the mean of its divisors is an integer number (14494224).

Almost surely, 2^55561169 is an apocalyptic number.

It is an amenable number.

55561169 is a deficient number, since it is larger than the sum of its proper divisors (2415727).

55561169 is a wasteful number, since it uses less digits than its factorization.

55561169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415726.

The product of its digits is 40500, while the sum is 38.

The square root of 55561169 is about 7453.9364767886. The cubic root of 55561169 is about 381.5842653312.

The spelling of 55561169 in words is "fifty-five million, five hundred sixty-one thousand, one hundred sixty-nine".