261204867 has 96 divisors (see below), whose sum is σ = 493968384. Its totient is φ = 129081600.

The previous prime is 261204863. The next prime is 261204871. The reversal of 261204867 is 768402162.

It is an interprime number because it is at equal distance from previous prime (261204863) and next prime (261204871).

It is not a de Polignac number, because 261204867 - 2² = 261204863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261204863) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1564018 + ... + 1564184.

It is an arithmetic number, because the mean of its divisors is an integer number (5145504).

Almost surely, 2^261204867 is an apocalyptic number.

261204867 is a deficient number, since it is larger than the sum of its proper divisors (232763517).

261204867 is a wasteful number, since it uses less digits than its factorization.

261204867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 286 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 261204867 is about 16161.8336521572. The cubic root of 261204867 is about 639.2348171214.

The spelling of 261204867 in words is "two hundred sixty-one million, two hundred four thousand, eight hundred sixty-seven".