291031077540 has 48 divisors (see below), whose sum is σ = 931299449472. Its totient is φ = 66521389056.

The previous prime is 291031077509. The next prime is 291031077541. The reversal of 291031077540 is 45770130192.

It is not an unprimeable number, because it can be changed into a prime (291031077541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346465149 + ... + 346465988.

It is an arithmetic number, because the mean of its divisors is an integer number (19402071864).

Almost surely, 2^291031077540 is an apocalyptic number.

291031077540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291031077540 is an abundant number, since it is smaller than the sum of its proper divisors (640268371932).

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

291031077540 is a wasteful number, since it uses less digits than its factorization.

291031077540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692931156 (or 692931154 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The spelling of 291031077540 in words is "two hundred ninety-one billion, thirty-one million, seventy-seven thousand, five hundred forty".