259998491 has 2 divisors, whose sum is σ = 259998492. Its totient is φ = 259998490.

The previous prime is 259998469. The next prime is 259998499. The reversal of 259998491 is 194899952.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-259998491 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (259998499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129999245 + 129999246.

It is an arithmetic number, because the mean of its divisors is an integer number (129999246).

Almost surely, 2^259998491 is an apocalyptic number.

259998491 is a deficient number, since it is larger than the sum of its proper divisors (1).

259998491 is an equidigital number, since it uses as much as digits as its factorization.

259998491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 56.

The square root of 259998491 is about 16124.4687044256. The cubic root of 259998491 is about 638.2491951145.

The spelling of 259998491 in words is "two hundred fifty-nine million, nine hundred ninety-eight thousand, four hundred ninety-one".