291179125205 has 6 divisors (see below), whose sum is σ = 349416398178. Its totient is φ = 232942334880.

The previous prime is 291179125201. The next prime is 291179125207. The reversal of 291179125205 is 502521971192.

It can be written as a sum of positive squares in 3 ways, for example, as 12267334564 + 278911790641 = 110758^2 + 528121^2 .

It is not a de Polignac number, because 291179125205 - 2² = 291179125201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (291179125201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1085945 + ... + 1327265.

It is an arithmetic number, because the mean of its divisors is an integer number (58236066363).

Almost surely, 2^291179125205 is an apocalyptic number.

It is an amenable number.

291179125205 is a deficient number, since it is larger than the sum of its proper divisors (58237272973).

291179125205 is an frugal number, since it uses more digits than its factorization.

291179125205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482647 (or 241326 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 44.

The spelling of 291179125205 in words is "two hundred ninety-one billion, one hundred seventy-nine million, one hundred twenty-five thousand, two hundred five".