261976959 has 12 divisors (see below), whose sum is σ = 398327800. Its totient is φ = 165459024.

The previous prime is 261976943. The next prime is 261976963. The reversal of 261976959 is 959679162.

It is not a de Polignac number, because 261976959 - 2⁴ = 261976943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261976999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 765844 + ... + 766185.

Almost surely, 2^261976959 is an apocalyptic number.

261976959 is a deficient number, since it is larger than the sum of its proper divisors (136350841).

261976959 is a wasteful number, since it uses less digits than its factorization.

261976959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532054 (or 1532051 counting only the distinct ones).

The product of its digits is 1837080, while the sum is 54.

The square root of 261976959 is about 16185.7023017230. The cubic root of 261976959 is about 639.8640328022.

The spelling of 261976959 in words is "two hundred sixty-one million, nine hundred seventy-six thousand, nine hundred fifty-nine".