259515961 has 4 divisors (see below), whose sum is σ = 259749412. Its totient is φ = 259282512.

The previous prime is 259515959. The next prime is 259515967. The reversal of 259515961 is 169515952.

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

It can be written as a sum of positive squares in 2 ways, for example, as 155475961 + 104040000 = 12469^2 + 10200^2 .

It is a cyclic number.

It is not a de Polignac number, because 259515961 - 2¹ = 259515959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (259515967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115050 + ... + 117283.

It is an arithmetic number, because the mean of its divisors is an integer number (64937353).

Almost surely, 2^259515961 is an apocalyptic number.

It is an amenable number.

259515961 is a deficient number, since it is larger than the sum of its proper divisors (233451).

259515961 is a wasteful number, since it uses less digits than its factorization.

259515961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233450.

The product of its digits is 121500, while the sum is 43.

The square root of 259515961 is about 16109.4990921506. The cubic root of 259515961 is about 637.8541093554.

Subtracting from 259515961 its reverse (169515952), we obtain a palindrome (90000009).

The spelling of 259515961 in words is "two hundred fifty-nine million, five hundred fifteen thousand, nine hundred sixty-one".