261641179 has 2 divisors, whose sum is σ = 261641180. Its totient is φ = 261641178.

The previous prime is 261641167. The next prime is 261641249. The reversal of 261641179 is 971146162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261641179 - 2²¹ = 259544027 is a prime.

It is a super-2 number, since 2×261641179² = 136912213097020082, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261645179) 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 as a sum of consecutive naturals, namely, 130820589 + 130820590.

It is an arithmetic number, because the mean of its divisors is an integer number (130820590).

Almost surely, 2^261641179 is an apocalyptic number.

261641179 is a deficient number, since it is larger than the sum of its proper divisors (1).

261641179 is an equidigital number, since it uses as much as digits as its factorization.

261641179 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 37.

The square root of 261641179 is about 16175.3262409140. The cubic root of 261641179 is about 639.5905413154.

The spelling of 261641179 in words is "two hundred sixty-one million, six hundred forty-one thousand, one hundred seventy-nine".