55415231 has 8 divisors (see below), whose sum is σ = 57616944. Its totient is φ = 53254080.

The previous prime is 55415221. The next prime is 55415251. The reversal of 55415231 is 13251455.

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

It is not a de Polignac number, because 55415231 - 2²² = 51220927 is a prime.

It is a super-2 number, since 2×55415231² = 6141695653566722, 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 55415231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55415221) 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, 7340 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (7202118).

Almost surely, 2^55415231 is an apocalyptic number.

55415231 is a deficient number, since it is larger than the sum of its proper divisors (2201713).

55415231 is a wasteful number, since it uses less digits than its factorization.

55415231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20281.

The product of its digits is 3000, while the sum is 26.

The square root of 55415231 is about 7444.1407160263. The cubic root of 55415231 is about 381.2498802830.

Adding to 55415231 its reverse (13251455), we get a palindrome (68666686).

The spelling of 55415231 in words is "fifty-five million, four hundred fifteen thousand, two hundred thirty-one".