261347579 has 8 divisors (see below), whose sum is σ = 276900768. Its totient is φ = 245814400.

The previous prime is 261347573. The next prime is 261347587. The reversal of 261347579 is 975743162.

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 261347579 - 2⁸ = 261347323 is a prime.

It is a super-2 number, since 2×261347579² = 136605114098322482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261347573) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28274 + ... + 36360.

It is an arithmetic number, because the mean of its divisors is an integer number (34612596).

Almost surely, 2^261347579 is an apocalyptic number.

261347579 is a deficient number, since it is larger than the sum of its proper divisors (15553189).

261347579 is a wasteful number, since it uses less digits than its factorization.

261347579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10005.

The product of its digits is 317520, while the sum is 44.

The square root of 261347579 is about 16166.2481423489. The cubic root of 261347579 is about 639.3512134595.

The spelling of 261347579 in words is "two hundred sixty-one million, three hundred forty-seven thousand, five hundred seventy-nine".