259599991 has 12 divisors (see below), whose sum is σ = 302546880. Its totient is φ = 222099360.

The previous prime is 259599973. The next prime is 259600007. The reversal of 259599991 is 199995952.

It is not a de Polignac number, because 259599991 - 2¹⁵ = 259567223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259599931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23226 + ... + 32536.

It is an arithmetic number, because the mean of its divisors is an integer number (25212240).

Almost surely, 2^259599991 is an apocalyptic number.

259599991 is a deficient number, since it is larger than the sum of its proper divisors (42946889).

259599991 is an equidigital number, since it uses as much as digits as its factorization.

259599991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9894 (or 9887 counting only the distinct ones).

The product of its digits is 2952450, while the sum is 58.

The square root of 259599991 is about 16112.1069696052. The cubic root of 259599991 is about 637.9229466074.

The spelling of 259599991 in words is "two hundred fifty-nine million, five hundred ninety-nine thousand, nine hundred ninety-one".