261253351 has 4 divisors (see below), whose sum is σ = 263310592. Its totient is φ = 259196112.

The previous prime is 261253327. The next prime is 261253361. The reversal of 261253351 is 153352162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261253351 - 2⁵ = 261253319 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 (261253361) 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, 1028430 + ... + 1028683.

It is an arithmetic number, because the mean of its divisors is an integer number (65827648).

Almost surely, 2^261253351 is an apocalyptic number.

261253351 is a deficient number, since it is larger than the sum of its proper divisors (2057241).

261253351 is a wasteful number, since it uses less digits than its factorization.

261253351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057240.

The product of its digits is 5400, while the sum is 28.

The square root of 261253351 is about 16163.3335361243. Note that the first 3 decimals coincide. The cubic root of 261253351 is about 639.2743655722.

The spelling of 261253351 in words is "two hundred sixty-one million, two hundred fifty-three thousand, three hundred fifty-one".