261130863 has 32 divisors (see below), whose sum is σ = 422945280. Its totient is φ = 140384640.

The previous prime is 261130843. The next prime is 261130901. The reversal of 261130863 is 368031162.

It is not a de Polignac number, because 261130863 - 2⁸ = 261130607 is a prime.

It is a super-2 number, since 2×261130863² = 136378655222249538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261130863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261130843) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101908 + ... + 104438.

It is an arithmetic number, because the mean of its divisors is an integer number (13217040).

Almost surely, 2^261130863 is an apocalyptic number.

261130863 is a deficient number, since it is larger than the sum of its proper divisors (161814417).

261130863 is an equidigital number, since it uses as much as digits as its factorization.

261130863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592 (or 2558 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 261130863 is about 16159.5440220323. The cubic root of 261130863 is about 639.1744425423.

The spelling of 261130863 in words is "two hundred sixty-one million, one hundred thirty thousand, eight hundred sixty-three".