642311259 has 16 divisors (see below), whose sum is σ = 878169600. Its totient is φ = 417404000.

The previous prime is 642311239. The next prime is 642311269. The reversal of 642311259 is 952113246.

It is a cyclic number.

It is not a de Polignac number, because 642311259 - 2²³ = 633922651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642311239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26317 + ... + 44465.

It is an arithmetic number, because the mean of its divisors is an integer number (54885600).

Almost surely, 2^642311259 is an apocalyptic number.

642311259 is a deficient number, since it is larger than the sum of its proper divisors (235858341).

642311259 is a wasteful number, since it uses less digits than its factorization.

642311259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450.

The product of its digits is 12960, while the sum is 33.

The square root of 642311259 is about 25343.8603807707. The cubic root of 642311259 is about 862.8100165108.

The spelling of 642311259 in words is "six hundred forty-two million, three hundred eleven thousand, two hundred fifty-nine".