55565531 has 4 divisors (see below), whose sum is σ = 63503472. Its totient is φ = 47627592.

The previous prime is 55565509. The next prime is 55565533. The reversal of 55565531 is 13556555.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55565531 - 2⁶ = 55565467 is a prime.

It is a super-2 number, since 2×55565531² = 6175056470623922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55565491 and 55565500.

It is not an unprimeable number, because it can be changed into a prime (55565533) 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, 3968960 + ... + 3968973.

It is an arithmetic number, because the mean of its divisors is an integer number (15875868).

Almost surely, 2^55565531 is an apocalyptic number.

55565531 is a deficient number, since it is larger than the sum of its proper divisors (7937941).

55565531 is an equidigital number, since it uses as much as digits as its factorization.

55565531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7937940.

The product of its digits is 56250, while the sum is 35.

The square root of 55565531 is about 7454.2290681197. The cubic root of 55565531 is about 381.5942508843.

The spelling of 55565531 in words is "fifty-five million, five hundred sixty-five thousand, five hundred thirty-one".