261247959 has 36 divisors (see below), whose sum is σ = 464802624. Its totient is φ = 140499072.

The previous prime is 261247937. The next prime is 261247963. The reversal of 261247959 is 959742162.

It is not a de Polignac number, because 261247959 - 2⁸ = 261247703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261242959) by changing a digit.

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, 9927 + ... + 24920.

It is an arithmetic number, because the mean of its divisors is an integer number (12911184).

Almost surely, 2^261247959 is an apocalyptic number.

261247959 is a deficient number, since it is larger than the sum of its proper divisors (203554665).

261247959 is a wasteful number, since it uses less digits than its factorization.

261247959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34884 (or 34874 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 261247959 is about 16163.1667379879. The cubic root of 261247959 is about 639.2699675538.

The spelling of 261247959 in words is "two hundred sixty-one million, two hundred forty-seven thousand, nine hundred fifty-nine".