259403806489 has 3 divisors (see below), whose sum is σ = 259404315807. Its totient is φ = 259403297172.

The previous prime is 259403806471. The next prime is 259403806507. The reversal of 259403806489 is 984608304952.

The square root of 259403806489 is 509317.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (259403806471) and next prime (259403806507).

It can be written as a sum of positive squares in only one way, i.e., 193710015625 + 65693790864 = 440125^2 + 256308^2 .

It is not a de Polignac number, because 259403806489 - 2⁵ = 259403806457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259403804489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 254659 + ... + 763975.

It is an arithmetic number, because the mean of its divisors is an integer number (86468105269).

Almost surely, 2^259403806489 is an apocalyptic number.

259403806489 is the 509317-th square number.

259403806489 is the 254659-th centered octagonal number.

It is an amenable number.

259403806489 is a deficient number, since it is larger than the sum of its proper divisors (509318).

259403806489 is an frugal number, since it uses more digits than its factorization.

259403806489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1018634 (or 509317 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 58.

The spelling of 259403806489 in words is "two hundred fifty-nine billion, four hundred three million, eight hundred six thousand, four hundred eighty-nine".