55427231 has 2 divisors, whose sum is σ = 55427232. Its totient is φ = 55427230.

The previous prime is 55427227. The next prime is 55427233. The reversal of 55427231 is 13272455.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55427231 - 2² = 55427227 is a prime.

It is a super-2 number, since 2×55427231² = 6144355872654722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 55427233, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_3306188 and since 55427231 and 3306188 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 55427194 and 55427203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55427233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27713615 + 27713616.

It is an arithmetic number, because the mean of its divisors is an integer number (27713616).

Almost surely, 2^55427231 is an apocalyptic number.

55427231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55427231 is an equidigital number, since it uses as much as digits as its factorization.

55427231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 29.

The square root of 55427231 is about 7444.9466754303. The cubic root of 55427231 is about 381.2773977982.

Adding to 55427231 its reverse (13272455), we get a palindrome (68699686).

The spelling of 55427231 in words is "fifty-five million, four hundred twenty-seven thousand, two hundred thirty-one".