261275331 has 16 divisors (see below), whose sum is σ = 363949056. Its totient is φ = 166410816.

The previous prime is 261275321. The next prime is 261275369. The reversal of 261275331 is 133572162.

It is not a de Polignac number, because 261275331 - 2¹⁸ = 261013187 is a prime.

It is a super-2 number, since 2×261275331² = 136529597178319122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261275321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74391 + ... + 77823.

It is an arithmetic number, because the mean of its divisors is an integer number (22746816).

Almost surely, 2^261275331 is an apocalyptic number.

261275331 is a deficient number, since it is larger than the sum of its proper divisors (102673725).

261275331 is a wasteful number, since it uses less digits than its factorization.

261275331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4562.

The product of its digits is 7560, while the sum is 30.

The square root of 261275331 is about 16164.0134558222. The cubic root of 261275331 is about 639.2922930698.

The spelling of 261275331 in words is "two hundred sixty-one million, two hundred seventy-five thousand, three hundred thirty-one".