55011631 has 4 divisors (see below), whose sum is σ = 57907000. Its totient is φ = 52116264.

The previous prime is 55011599. The next prime is 55011641. The reversal of 55011631 is 13611055.

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 55011631 - 2⁵ = 55011599 is a prime.

It is a super-2 number, since 2×55011631² = 6052559090560322, 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 (55011641) 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, 1447656 + ... + 1447693.

It is an arithmetic number, because the mean of its divisors is an integer number (14476750).

Almost surely, 2^55011631 is an apocalyptic number.

55011631 is a deficient number, since it is larger than the sum of its proper divisors (2895369).

55011631 is a wasteful number, since it uses less digits than its factorization.

55011631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2895368.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 55011631 is about 7416.9826075029. The cubic root of 55011631 is about 380.3220515443.

Adding to 55011631 its reverse (13611055), we get a palindrome (68622686).

The spelling of 55011631 in words is "fifty-five million, eleven thousand, six hundred thirty-one".