55144631 has 16 divisors (see below), whose sum is σ = 61538400. Its totient is φ = 49190400.

The previous prime is 55144627. The next prime is 55144633. The reversal of 55144631 is 13644155.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 55144631 - 2² = 55144627 is a prime.

It is a super-2 number, since 2×55144631² = 6081860656252322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55144594 and 55144603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55144633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21371 + ... + 23811.

It is an arithmetic number, because the mean of its divisors is an integer number (3846150).

Almost surely, 2^55144631 is an apocalyptic number.

55144631 is a deficient number, since it is larger than the sum of its proper divisors (6393769).

55144631 is a wasteful number, since it uses less digits than its factorization.

55144631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2530.

The product of its digits is 7200, while the sum is 29.

The square root of 55144631 is about 7425.9431050877. The cubic root of 55144631 is about 380.6283026794.

Adding to 55144631 its reverse (13644155), we get a palindrome (68788786).

It can be divided in two parts, 551 and 44631, that multiplied together give a square (24591681 = 4959²).

The spelling of 55144631 in words is "fifty-five million, one hundred forty-four thousand, six hundred thirty-one".