279125591 has 2 divisors, whose sum is σ = 279125592. Its totient is φ = 279125590.

The previous prime is 279125579. The next prime is 279125593. The reversal of 279125591 is 195521972.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-279125591 is a prime.

It is a super-2 number, since 2×279125591² = 155822191102198562, which contains 22 as substring.

Together with 279125593, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (279125593) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 139562795 + 139562796.

It is an arithmetic number, because the mean of its divisors is an integer number (139562796).

Almost surely, 2^279125591 is an apocalyptic number.

279125591 is a deficient number, since it is larger than the sum of its proper divisors (1).

279125591 is an equidigital number, since it uses as much as digits as its factorization.

279125591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 41.

The square root of 279125591 is about 16707.0521337548. The cubic root of 279125591 is about 653.5315400348.

It can be divided in two parts, 2791 and 25591, that added together give a palindrome (28382).

The spelling of 279125591 in words is "two hundred seventy-nine million, one hundred twenty-five thousand, five hundred ninety-one".