55231231 has 8 divisors (see below), whose sum is σ = 60370128. Its totient is φ = 50112000.

The previous prime is 55231219. The next prime is 55231259. The reversal of 55231231 is 13213255.

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 55231231 - 2⁵ = 55231199 is a prime.

It is a super-2 number, since 2×55231231² = 6100977755550722, 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 (55231201) 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, 1311 + ... + 10591.

It is an arithmetic number, because the mean of its divisors is an integer number (7546266).

Almost surely, 2^55231231 is an apocalyptic number.

55231231 is a deficient number, since it is larger than the sum of its proper divisors (5138897).

55231231 is a wasteful number, since it uses less digits than its factorization.

55231231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9833.

The product of its digits is 900, while the sum is 22.

The square root of 55231231 is about 7431.7717268495. The cubic root of 55231231 is about 380.8274467034.

Adding to 55231231 its reverse (13213255), we get a palindrome (68444486).

The spelling of 55231231 in words is "fifty-five million, two hundred thirty-one thousand, two hundred thirty-one".