261164875 has 32 divisors (see below), whose sum is σ = 337296960. Its totient is φ = 201760000.

The previous prime is 261164831. The next prime is 261164887. The reversal of 261164875 is 578461162.

It is not a de Polignac number, because 261164875 - 2¹¹ = 261162827 is a prime.

Its product of digits (80640) is a multiple of the sum of its prime factors (576).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 671181 + ... + 671569.

It is an arithmetic number, because the mean of its divisors is an integer number (10540530).

Almost surely, 2^261164875 is an apocalyptic number.

261164875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

261164875 is a deficient number, since it is larger than the sum of its proper divisors (76132085).

261164875 is a wasteful number, since it uses less digits than its factorization.

261164875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 566 counting only the distinct ones).

The product of its digits is 80640, while the sum is 40.

The square root of 261164875 is about 16160.5963689463. The cubic root of 261164875 is about 639.2021919207.

The spelling of 261164875 in words is "two hundred sixty-one million, one hundred sixty-four thousand, eight hundred seventy-five".