261335275 has 24 divisors (see below), whose sum is σ = 332925120. Its totient is φ = 203400960.

The previous prime is 261335251. The next prime is 261335287. The reversal of 261335275 is 572533162.

It is not a de Polignac number, because 261335275 - 2⁷ = 261335147 is a prime.

It is a super-2 number, since 2×261335275² = 136592251918651250, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261335275.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 230911 + ... + 232039.

It is an arithmetic number, because the mean of its divisors is an integer number (13871880).

Almost surely, 2^261335275 is an apocalyptic number.

261335275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261335275 is a deficient number, since it is larger than the sum of its proper divisors (71589845).

261335275 is a wasteful number, since it uses less digits than its factorization.

261335275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1383 (or 1378 counting only the distinct ones).

The product of its digits is 37800, while the sum is 34.

The square root of 261335275 is about 16165.8675919358. The cubic root of 261335275 is about 639.3411799493.

The spelling of 261335275 in words is "two hundred sixty-one million, three hundred thirty-five thousand, two hundred seventy-five".