261272297 has 16 divisors (see below), whose sum is σ = 310661568. Its totient is φ = 216598080.

The previous prime is 261272293. The next prime is 261272299. The reversal of 261272297 is 792272162.

It is a cyclic number.

It is not a de Polignac number, because 261272297 - 2² = 261272293 is a prime.

It is a super-4 number, since 4×261272297⁴ (a number of 35 digits) contains 4444 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261272297.

It is not an unprimeable number, because it can be changed into a prime (261272293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 863 + ... + 22875.

It is an arithmetic number, because the mean of its divisors is an integer number (19416348).

Almost surely, 2^261272297 is an apocalyptic number.

It is an amenable number.

261272297 is a deficient number, since it is larger than the sum of its proper divisors (49389271).

261272297 is a wasteful number, since it uses less digits than its factorization.

261272297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22120.

The product of its digits is 42336, while the sum is 38.

The square root of 261272297 is about 16163.9196050958. The cubic root of 261272297 is about 639.2898185151.

The spelling of 261272297 in words is "two hundred sixty-one million, two hundred seventy-two thousand, two hundred ninety-seven".