259641987 has 32 divisors (see below), whose sum is σ = 389635584. Its totient is φ = 152409600.

The previous prime is 259641983. The next prime is 259641997. The reversal of 259641987 is 789146952.

It is not a de Polignac number, because 259641987 - 2² = 259641983 is a prime.

It is a super-2 number, since 2×259641987² = 134827922826616338, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (259641983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 411162 + ... + 411792.

It is an arithmetic number, because the mean of its divisors is an integer number (12176112).

Almost surely, 2^259641987 is an apocalyptic number.

259641987 is a deficient number, since it is larger than the sum of its proper divisors (129993597).

259641987 is a wasteful number, since it uses less digits than its factorization.

259641987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019.

The product of its digits is 1088640, while the sum is 51.

The square root of 259641987 is about 16113.4101604843. The cubic root of 259641987 is about 637.9573441016.

It can be divided in two parts, 259 and 641987, that added together give a palindrome (642246).

The spelling of 259641987 in words is "two hundred fifty-nine million, six hundred forty-one thousand, nine hundred eighty-seven".