55532331 has 8 divisors (see below), whose sum is σ = 82270160. Its totient is φ = 37021536.

The previous prime is 55532317. The next prime is 55532359. The reversal of 55532331 is 13323555.

It is not a de Polignac number, because 55532331 - 2⁵ = 55532299 is a prime.

It is a super-2 number, since 2×55532331² = 6167679572587122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2056753 = 55532331 / (5 + 5 + 5 + 3 + 2 + 3 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55532295 and 55532304.

It is not an unprimeable number, because it can be changed into a prime (55532311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1028350 + ... + 1028403.

It is an arithmetic number, because the mean of its divisors is an integer number (10283770).

Almost surely, 2^55532331 is an apocalyptic number.

55532331 is a deficient number, since it is larger than the sum of its proper divisors (26737829).

55532331 is a wasteful number, since it uses less digits than its factorization.

55532331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056762 (or 2056756 counting only the distinct ones).

The product of its digits is 6750, while the sum is 27.

The square root of 55532331 is about 7452.0018115940. The cubic root of 55532331 is about 381.5182358144.

Subtracting from 55532331 its sum of digits (27), we obtain a square (55532304 = 7452²).

Adding to 55532331 its reverse (13323555), we get a palindrome (68855886).

The spelling of 55532331 in words is "fifty-five million, five hundred thirty-two thousand, three hundred thirty-one".