55451331 has 32 divisors (see below), whose sum is σ = 93683520. Its totient is φ = 32113152.

The previous prime is 55451317. The next prime is 55451339. The reversal of 55451331 is 13315455.

It is not a de Polignac number, because 55451331 - 2²¹ = 53354179 is a prime.

It is a super-2 number, since 2×55451331² = 6149700219343122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 55451295 and 55451304.

It is not an unprimeable number, because it can be changed into a prime (55451339) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1321 + ... + 10613.

It is an arithmetic number, because the mean of its divisors is an integer number (2927610).

Almost surely, 2^55451331 is an apocalyptic number.

55451331 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55451331 is a deficient number, since it is larger than the sum of its proper divisors (38232189).

55451331 is a wasteful number, since it uses less digits than its factorization.

55451331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9332 (or 9326 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 55451331 is about 7446.5650470536. The cubic root of 55451331 is about 381.3326501453.

Adding to 55451331 its reverse (13315455), we get a palindrome (68766786).

The spelling of 55451331 in words is "fifty-five million, four hundred fifty-one thousand, three hundred thirty-one".