55870231 has 2 divisors, whose sum is σ = 55870232. Its totient is φ = 55870230.

The previous prime is 55870189. The next prime is 55870237. The reversal of 55870231 is 13207855.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55870231 is a prime.

It is a super-2 number, since 2×55870231² = 6242965423986722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 55870193 and 55870202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55870237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27935115 + 27935116.

It is an arithmetic number, because the mean of its divisors is an integer number (27935116).

Almost surely, 2^55870231 is an apocalyptic number.

55870231 is a deficient number, since it is larger than the sum of its proper divisors (1).

55870231 is an equidigital number, since it uses as much as digits as its factorization.

55870231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 55870231 is about 7474.6391886164. The cubic root of 55870231 is about 382.2904851707.

The spelling of 55870231 in words is "fifty-five million, eight hundred seventy thousand, two hundred thirty-one".