261132657 has 8 divisors (see below), whose sum is σ = 348310176. Its totient is φ = 174021792.

The previous prime is 261132647. The next prime is 261132659. The reversal of 261132657 is 756231162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 261132657 - 2²⁷ = 126914929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261132659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6663 + ... + 23804.

It is an arithmetic number, because the mean of its divisors is an integer number (43538772).

Almost surely, 2^261132657 is an apocalyptic number.

It is an amenable number.

261132657 is a deficient number, since it is larger than the sum of its proper divisors (87177519).

261132657 is a wasteful number, since it uses less digits than its factorization.

261132657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33327.

The product of its digits is 15120, while the sum is 33.

The square root of 261132657 is about 16159.5995309290. The cubic root of 261132657 is about 639.1759062737.

The spelling of 261132657 in words is "two hundred sixty-one million, one hundred thirty-two thousand, six hundred fifty-seven".