291401638540 has 12 divisors (see below), whose sum is σ = 611943440976. Its totient is φ = 116560655408.

The previous prime is 291401638499. The next prime is 291401638553. The reversal of 291401638540 is 45836104192.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7285040944 + ... + 7285040983.

It is an arithmetic number, because the mean of its divisors is an integer number (50995286748).

Almost surely, 2^291401638540 is an apocalyptic number.

291401638540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

291401638540 is an abundant number, since it is smaller than the sum of its proper divisors (320541802436).

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

291401638540 is a wasteful number, since it uses less digits than its factorization.

291401638540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14570081936 (or 14570081934 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 291401638540 in words is "two hundred ninety-one billion, four hundred one million, six hundred thirty-eight thousand, five hundred forty".