55231215 has 32 divisors (see below), whose sum is σ = 100771776. Its totient is φ = 25589760.

The previous prime is 55231207. The next prime is 55231219. The reversal of 55231215 is 51213255.

It is a happy number.

It is not a de Polignac number, because 55231215 - 2³ = 55231207 is a prime.

It is a super-2 number, since 2×55231215² = 6100974220752450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55231219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5016 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (3149118).

Almost surely, 2^55231215 is an apocalyptic number.

55231215 is a deficient number, since it is larger than the sum of its proper divisors (45540561).

55231215 is a wasteful number, since it uses less digits than its factorization.

55231215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16699.

The product of its digits is 1500, while the sum is 24.

The square root of 55231215 is about 7431.7706503901. The cubic root of 55231215 is about 380.8274099293.

The spelling of 55231215 in words is "fifty-five million, two hundred thirty-one thousand, two hundred fifteen".