261275297 has 8 divisors (see below), whose sum is σ = 270480000. Its totient is φ = 252083664.

The previous prime is 261275293. The next prime is 261275309. The reversal of 261275297 is 792572162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261275297 - 2² = 261275293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261275291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55718 + ... + 60224.

It is an arithmetic number, because the mean of its divisors is an integer number (33810000).

Almost surely, 2^261275297 is an apocalyptic number.

It is an amenable number.

261275297 is a deficient number, since it is larger than the sum of its proper divisors (9204703).

261275297 is a wasteful number, since it uses less digits than its factorization.

261275297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6535.

The product of its digits is 105840, while the sum is 41.

The square root of 261275297 is about 16164.0124041031. The cubic root of 261275297 is about 639.2922653392.

The spelling of 261275297 in words is "two hundred sixty-one million, two hundred seventy-five thousand, two hundred ninety-seven".