55406331 has 12 divisors (see below), whose sum is σ = 82613440. Its totient is φ = 35745840.

The previous prime is 55406297. The next prime is 55406347. The reversal of 55406331 is 13360455.

It is not a de Polignac number, because 55406331 - 2⁷ = 55406203 is a prime.

It is a super-2 number, since 2×55406331² = 6139723029763122, 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 = 55406295 and 55406304.

It is not an unprimeable number, because it can be changed into a prime (55406431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99016 + ... + 99573.

Almost surely, 2^55406331 is an apocalyptic number.

55406331 is a deficient number, since it is larger than the sum of its proper divisors (27207109).

55406331 is a wasteful number, since it uses less digits than its factorization.

55406331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198626 (or 198623 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 55406331 is about 7443.5429064391. The cubic root of 55406331 is about 381.2294688935.

Adding to 55406331 its reverse (13360455), we get a palindrome (68766786).

The spelling of 55406331 in words is "fifty-five million, four hundred six thousand, three hundred thirty-one".