71374500991 has 4 divisors (see below), whose sum is σ = 71773241400. Its totient is φ = 70975760584.

The previous prime is 71374500973. The next prime is 71374501013. The reversal of 71374500991 is 19900547317.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71374500991 - 2¹⁵ = 71374468223 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 (71374500971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199369936 + ... + 199370293.

It is an arithmetic number, because the mean of its divisors is an integer number (17943310350).

Almost surely, 2^71374500991 is an apocalyptic number.

71374500991 is a deficient number, since it is larger than the sum of its proper divisors (398740409).

71374500991 is a wasteful number, since it uses less digits than its factorization.

71374500991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398740408.

The product of its (nonzero) digits is 238140, while the sum is 46.

The spelling of 71374500991 in words is "seventy-one billion, three hundred seventy-four million, five hundred thousand, nine hundred ninety-one".