259242187 has 4 divisors (see below), whose sum is σ = 259302600. Its totient is φ = 259181776.

The previous prime is 259242173. The next prime is 259242211. The reversal of 259242187 is 781242952.

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 259242187 - 2⁷ = 259242059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259242127) 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, 23233 + ... + 32530.

It is an arithmetic number, because the mean of its divisors is an integer number (64825650).

Almost surely, 2^259242187 is an apocalyptic number.

259242187 is a deficient number, since it is larger than the sum of its proper divisors (60413).

259242187 is an equidigital number, since it uses as much as digits as its factorization.

259242187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60412.

The product of its digits is 80640, while the sum is 40.

The square root of 259242187 is about 16100.9995652444. Note that the first 3 decimals coincide. The cubic root of 259242187 is about 637.6297309734.

The spelling of 259242187 in words is "two hundred fifty-nine million, two hundred forty-two thousand, one hundred eighty-seven".