55131031 has 4 divisors (see below), whose sum is σ = 56413192. Its totient is φ = 53848872.

The previous prime is 55130981. The next prime is 55131049. The reversal of 55131031 is 13013155.

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 55131031 - 2⁷ = 55130903 is a prime.

It is a super-2 number, since 2×55131031² = 6078861158245922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55131061) 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, 641016 + ... + 641101.

It is an arithmetic number, because the mean of its divisors is an integer number (14103298).

Almost surely, 2^55131031 is an apocalyptic number.

55131031 is a deficient number, since it is larger than the sum of its proper divisors (1282161).

55131031 is a wasteful number, since it uses less digits than its factorization.

55131031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282160.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 55131031 is about 7425.0273400170. The cubic root of 55131031 is about 380.5970093910.

Adding to 55131031 its reverse (13013155), we get a palindrome (68144186).

It can be divided in two parts, 5513103 and 1, that added together give a square (5513104 = 2348²).

The spelling of 55131031 in words is "fifty-five million, one hundred thirty-one thousand, thirty-one".