55163231 has 2 divisors, whose sum is σ = 55163232. Its totient is φ = 55163230.

The previous prime is 55163219. The next prime is 55163261. The reversal of 55163231 is 13236155.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55163231 is a prime.

It is a super-2 number, since 2×55163231² = 6085964108718722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55163231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55163201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27581615 + 27581616.

It is an arithmetic number, because the mean of its divisors is an integer number (27581616).

Almost surely, 2^55163231 is an apocalyptic number.

55163231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55163231 is an equidigital number, since it uses as much as digits as its factorization.

55163231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2700, while the sum is 26.

The square root of 55163231 is about 7427.1953656814. The cubic root of 55163231 is about 380.6710925242.

Adding to 55163231 its reverse (13236155), we get a palindrome (68399386).

The spelling of 55163231 in words is "fifty-five million, one hundred sixty-three thousand, two hundred thirty-one".