55561231 has 8 divisors (see below), whose sum is σ = 60781824. Its totient is φ = 50368920.

The previous prime is 55561213. The next prime is 55561243. The reversal of 55561231 is 13216555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55561231 - 2⁹ = 55560719 is a prime.

It is a super-2 number, since 2×55561231² = 6174100780470722, 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 55561231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55561271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2845 + ... + 10918.

It is an arithmetic number, because the mean of its divisors is an integer number (7597728).

Almost surely, 2^55561231 is an apocalyptic number.

55561231 is a deficient number, since it is larger than the sum of its proper divisors (5220593).

55561231 is a wasteful number, since it uses less digits than its factorization.

55561231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14141.

The product of its digits is 4500, while the sum is 28.

The square root of 55561231 is about 7453.9406356638. The cubic root of 55561231 is about 381.5844072662.

Adding to 55561231 its reverse (13216555), we get a palindrome (68777786).

The spelling of 55561231 in words is "fifty-five million, five hundred sixty-one thousand, two hundred thirty-one".