55180331 has 4 divisors (see below), whose sum is σ = 55266792. Its totient is φ = 55093872.

The previous prime is 55180297. The next prime is 55180337. The reversal of 55180331 is 13308155.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55180331 is a prime.

It is a super-2 number, since 2×55180331² = 6089737858539122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55180331.

It is not an unprimeable number, because it can be changed into a prime (55180337) 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, 42266 + ... + 43551.

It is an arithmetic number, because the mean of its divisors is an integer number (13816698).

Almost surely, 2^55180331 is an apocalyptic number.

55180331 is a deficient number, since it is larger than the sum of its proper divisors (86461).

55180331 is an equidigital number, since it uses as much as digits as its factorization.

55180331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86460.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55180331 is about 7428.3464512636. The cubic root of 55180331 is about 380.7104230894.

Adding to 55180331 its reverse (13308155), we get a palindrome (68488486).

The spelling of 55180331 in words is "fifty-five million, one hundred eighty thousand, three hundred thirty-one".