261291659 has 8 divisors (see below), whose sum is σ = 267624000. Its totient is φ = 254991616.

The previous prime is 261291623. The next prime is 261291671. The reversal of 261291659 is 956192162.

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

It is a cyclic number.

It is not a de Polignac number, because 261291659 - 2⁸ = 261291403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261291619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8717 + ... + 24465.

It is an arithmetic number, because the mean of its divisors is an integer number (33453000).

Almost surely, 2^261291659 is an apocalyptic number.

261291659 is a deficient number, since it is larger than the sum of its proper divisors (6332341).

261291659 is a wasteful number, since it uses less digits than its factorization.

261291659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16149.

The product of its digits is 58320, while the sum is 41.

The square root of 261291659 is about 16164.5185205128. The cubic root of 261291659 is about 639.3056099886.

The spelling of 261291659 in words is "two hundred sixty-one million, two hundred ninety-one thousand, six hundred fifty-nine".