261253610 has 16 divisors (see below), whose sum is σ = 495007200. Its totient is φ = 99001296.

The previous prime is 261253579. The next prime is 261253621. The reversal of 261253610 is 16352162.

261253610 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 261253610.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 687320 + ... + 687699.

It is an arithmetic number, because the mean of its divisors is an integer number (30937950).

Almost surely, 2^261253610 is an apocalyptic number.

261253610 is a deficient number, since it is larger than the sum of its proper divisors (233753590).

261253610 is a wasteful number, since it uses less digits than its factorization.

261253610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375045.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 261253610 is about 16163.3415480834. The cubic root of 261253610 is about 639.2745768256.

The spelling of 261253610 in words is "two hundred sixty-one million, two hundred fifty-three thousand, six hundred ten".