55136231 has 2 divisors, whose sum is σ = 55136232. Its totient is φ = 55136230.

The previous prime is 55136227. The next prime is 55136239. The reversal of 55136231 is 13263155.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55136231 - 2² = 55136227 is a prime.

It is a super-2 number, since 2×55136231² = 6080007937770722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55136231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55136239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27568115 + 27568116.

It is an arithmetic number, because the mean of its divisors is an integer number (27568116).

Almost surely, 2^55136231 is an apocalyptic number.

55136231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55136231 is an equidigital number, since it uses as much as digits as its factorization.

55136231 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 55136231 is about 7425.3774988212. The cubic root of 55136231 is about 380.6089750795.

Adding to 55136231 its reverse (13263155), we get a palindrome (68399386).

The spelling of 55136231 in words is "fifty-five million, one hundred thirty-six thousand, two hundred thirty-one".