261965375 has 16 divisors (see below), whose sum is σ = 373638720. Its totient is φ = 179632800.

The previous prime is 261965321. The next prime is 261965383. The reversal of 261965375 is 573569162.

It is not a de Polignac number, because 261965375 - 2⁶ = 261965311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 148820 + ... + 150569.

It is an arithmetic number, because the mean of its divisors is an integer number (23352420).

Almost surely, 2^261965375 is an apocalyptic number.

261965375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261965375 is a deficient number, since it is larger than the sum of its proper divisors (111673345).

261965375 is an equidigital number, since it uses as much as digits as its factorization.

261965375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299411 (or 299401 counting only the distinct ones).

The product of its digits is 340200, while the sum is 44.

The square root of 261965375 is about 16185.3444510767. The cubic root of 261965375 is about 639.8546015730.

The spelling of 261965375 in words is "two hundred sixty-one million, nine hundred sixty-five thousand, three hundred seventy-five".