259918891 has 2 divisors, whose sum is σ = 259918892. Its totient is φ = 259918890.

The previous prime is 259918877. The next prime is 259918903. The reversal of 259918891 is 198819952.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 259918891 - 2¹⁷ = 259787819 is a prime.

It is not a weakly prime, because it can be changed into another prime (259918801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129959445 + 129959446.

It is an arithmetic number, because the mean of its divisors is an integer number (129959446).

Almost surely, 2^259918891 is an apocalyptic number.

259918891 is a deficient number, since it is larger than the sum of its proper divisors (1).

259918891 is an equidigital number, since it uses as much as digits as its factorization.

259918891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 52.

The square root of 259918891 is about 16122.0002170947. Note that the first 3 decimals coincide. The cubic root of 259918891 is about 638.1840539396.

The spelling of 259918891 in words is "two hundred fifty-nine million, nine hundred eighteen thousand, eight hundred ninety-one".