261253312 has 28 divisors (see below), whose sum is σ = 531074376. Its totient is φ = 127439360.

The previous prime is 261253309. The next prime is 261253313. The reversal of 261253312 is 213352162.

It is not an unprimeable number, because it can be changed into a prime (261253313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47158 + ... + 52405.

It is an arithmetic number, because the mean of its divisors is an integer number (18966942).

Almost surely, 2^261253312 is an apocalyptic number.

It is an amenable number.

261253312 is an abundant number, since it is smaller than the sum of its proper divisors (269821064).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261253312 is an equidigital number, since it uses as much as digits as its factorization.

261253312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99616 (or 99606 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 261253312 is about 16163.3323296899. The cubic root of 261253312 is about 639.2743337618.

The spelling of 261253312 in words is "two hundred sixty-one million, two hundred fifty-three thousand, three hundred twelve".