55509569 has 4 divisors (see below), whose sum is σ = 55720896. Its totient is φ = 55298244.

The previous prime is 55509551. The next prime is 55509577. The reversal of 55509569 is 96590555.

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-55509569 is a prime.

It is a super-2 number, since 2×55509569² = 6162624501131522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55509529) 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, 105269 + ... + 105794.

It is an arithmetic number, because the mean of its divisors is an integer number (13930224).

Almost surely, 2^55509569 is an apocalyptic number.

It is an amenable number.

55509569 is a deficient number, since it is larger than the sum of its proper divisors (211327).

55509569 is a wasteful number, since it uses less digits than its factorization.

55509569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211326.

The product of its (nonzero) digits is 303750, while the sum is 44.

The square root of 55509569 is about 7450.4744144249. The cubic root of 55509569 is about 381.4661021913.

The spelling of 55509569 in words is "fifty-five million, five hundred nine thousand, five hundred sixty-nine".