55131331 has 4 divisors (see below), whose sum is σ = 58033000. Its totient is φ = 52229664.

The previous prime is 55131319. The next prime is 55131337. The reversal of 55131331 is 13313155.

55131331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 55131331 - 2⁹ = 55130819 is a prime.

It is a super-2 number, since 2×55131331² = 6078927315663122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55131337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1450806 + ... + 1450843.

It is an arithmetic number, because the mean of its divisors is an integer number (14508250).

Almost surely, 2^55131331 is an apocalyptic number.

55131331 is a deficient number, since it is larger than the sum of its proper divisors (2901669).

55131331 is a wasteful number, since it uses less digits than its factorization.

55131331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2901668.

The product of its digits is 675, while the sum is 22.

The square root of 55131331 is about 7425.0475419353. The cubic root of 55131331 is about 380.5976997396.

Adding to 55131331 its reverse (13313155), we get a palindrome (68444486).

The spelling of 55131331 in words is "fifty-five million, one hundred thirty-one thousand, three hundred thirty-one".