291079922018 has 18 divisors (see below), whose sum is σ = 463834870083. Its totient is φ = 136972682880.

The previous prime is 291079921999. The next prime is 291079922033. The reversal of 291079922018 is 810229970192.

It can be written as a sum of positive squares in 5 ways, for example, as 60893952289 + 230185969729 = 246767^2 + 479777^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=381497.

It is a super-2 number, since 2×291079922018² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 12959678 + ... + 12982118.

Almost surely, 2^291079922018 is an apocalyptic number.

291079922018 is a deficient number, since it is larger than the sum of its proper divisors (172754948065).

291079922018 is an frugal number, since it uses more digits than its factorization.

291079922018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44918 (or 22460 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 50.

Multiplying 291079922018 by its sum of digits (50), we get a square (14553996100900 = 3814970²).

The spelling of 291079922018 in words is "two hundred ninety-one billion, seventy-nine million, nine hundred twenty-two thousand, eighteen".