261520675 has 36 divisors (see below), whose sum is σ = 356425104. Its totient is φ = 189216000.

The previous prime is 261520669. The next prime is 261520687. The reversal of 261520675 is 576025162.

It is not a de Polignac number, because 261520675 - 2³ = 261520667 is a prime.

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 261520675.

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 35 ways as a sum of consecutive naturals, for example, 1731850 + ... + 1732000.

Almost surely, 2^261520675 is an apocalyptic number.

261520675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261520675 is a deficient number, since it is larger than the sum of its proper divisors (94904429).

261520675 is a wasteful number, since it uses less digits than its factorization.

261520675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 261520675 is about 16171.6008793193. The cubic root of 261520675 is about 639.4923342283.

The spelling of 261520675 in words is "two hundred sixty-one million, five hundred twenty thousand, six hundred seventy-five".