55612231 has 2 divisors, whose sum is σ = 55612232. Its totient is φ = 55612230.

The previous prime is 55612217. The next prime is 55612237. The reversal of 55612231 is 13221655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55612231 - 2⁹ = 55611719 is a prime.

It is a super-2 number, since 2×55612231² = 6185440473594722, which contains 22 as substring.

It is equal to p_3316534 and since 55612231 and 3316534 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 = 55612196 and 55612205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55612237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27806115 + 27806116.

It is an arithmetic number, because the mean of its divisors is an integer number (27806116).

Almost surely, 2^55612231 is an apocalyptic number.

55612231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55612231 is an equidigital number, since it uses as much as digits as its factorization.

55612231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 25.

The square root of 55612231 is about 7457.3608602508. The cubic root of 55612231 is about 381.7011244630.

Adding to 55612231 its reverse (13221655), we get a palindrome (68833886).

The spelling of 55612231 in words is "fifty-five million, six hundred twelve thousand, two hundred thirty-one".