291279318140 has 48 divisors (see below), whose sum is σ = 640210314240. Its totient is φ = 111109247040.

The previous prime is 291279318131. The next prime is 291279318203. The reversal of 291279318140 is 41813972192.

It is a super-2 number, since 2×291279318140² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 804260 + ... + 1108779.

It is an arithmetic number, because the mean of its divisors is an integer number (13337714880).

Almost surely, 2^291279318140 is an apocalyptic number.

291279318140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291279318140 is an abundant number, since it is smaller than the sum of its proper divisors (348930996100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

291279318140 is a wasteful number, since it uses less digits than its factorization.

291279318140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913402 (or 1913400 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 47.

The spelling of 291279318140 in words is "two hundred ninety-one billion, two hundred seventy-nine million, three hundred eighteen thousand, one hundred forty".