55712231 has 2 divisors, whose sum is σ = 55712232. Its totient is φ = 55712230.

The previous prime is 55712227. The next prime is 55712243. The reversal of 55712231 is 13221755.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55712231 - 2² = 55712227 is a prime.

It is a super-2 number, since 2×55712231² = 6207705365994722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55712231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55712291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27856115 + 27856116.

It is an arithmetic number, because the mean of its divisors is an integer number (27856116).

Almost surely, 2^55712231 is an apocalyptic number.

55712231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55712231 is an equidigital number, since it uses as much as digits as its factorization.

55712231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2100, while the sum is 26.

The square root of 55712231 is about 7464.0626337136. The cubic root of 55712231 is about 381.9297747429.

Adding to 55712231 its reverse (13221755), we get a palindrome (68933986).

The spelling of 55712231 in words is "fifty-five million, seven hundred twelve thousand, two hundred thirty-one".