259279991 has 2 divisors, whose sum is σ = 259279992. Its totient is φ = 259279990.

The previous prime is 259279961. The next prime is 259280003. The reversal of 259279991 is 199972952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 259279991 - 2⁶ = 259279927 is a prime.

It is a super-2 number, since 2×259279991² = 134452227465920162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (259279961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129639995 + 129639996.

It is an arithmetic number, because the mean of its divisors is an integer number (129639996).

Almost surely, 2^259279991 is an apocalyptic number.

259279991 is a deficient number, since it is larger than the sum of its proper divisors (1).

259279991 is an equidigital number, since it uses as much as digits as its factorization.

259279991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 918540, while the sum is 53.

The square root of 259279991 is about 16102.1734868309. The cubic root of 259279991 is about 637.6607235921.

The spelling of 259279991 in words is "two hundred fifty-nine million, two hundred seventy-nine thousand, nine hundred ninety-one".