261545875 has 16 divisors (see below), whose sum is σ = 328779360. Its totient is φ = 207717600.

The previous prime is 261545861. The next prime is 261545923. The reversal of 261545875 is 578545162.

It is a de Polignac number, because none of the positive numbers 2^k-261545875 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9849 + ... + 24901.

It is an arithmetic number, because the mean of its divisors is an integer number (20548710).

Almost surely, 2^261545875 is an apocalyptic number.

261545875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261545875 is a deficient number, since it is larger than the sum of its proper divisors (67233485).

261545875 is a wasteful number, since it uses less digits than its factorization.

261545875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15207 (or 15197 counting only the distinct ones).

The product of its digits is 336000, while the sum is 43.

The square root of 261545875 is about 16172.3800041923. The cubic root of 261545875 is about 639.5128739546.

The spelling of 261545875 in words is "two hundred sixty-one million, five hundred forty-five thousand, eight hundred seventy-five".