259965631 has 4 divisors (see below), whose sum is σ = 260027352. Its totient is φ = 259903912.

The previous prime is 259965613. The next prime is 259965647. The reversal of 259965631 is 136569952.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 259965631 - 2⁹ = 259965119 is a prime.

It is a super-2 number, since 2×259965631² = 135164258602456322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (259965691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24040 + ... + 33133.

It is an arithmetic number, because the mean of its divisors is an integer number (65006838).

Almost surely, 2^259965631 is an apocalyptic number.

259965631 is a deficient number, since it is larger than the sum of its proper divisors (61721).

259965631 is an equidigital number, since it uses as much as digits as its factorization.

259965631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61720.

The product of its digits is 437400, while the sum is 46.

The square root of 259965631 is about 16123.4497239269. The cubic root of 259965631 is about 638.2223055326. Note that the first 3 decimals are identical.

The spelling of 259965631 in words is "two hundred fifty-nine million, nine hundred sixty-five thousand, six hundred thirty-one".