91715373194 has 4 divisors (see below), whose sum is σ = 137573059794. Its totient is φ = 45857686596.

The previous prime is 91715373121. The next prime is 91715373199. The reversal of 91715373194 is 49137351719.

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

It can be written as a sum of positive squares in only one way, i.e., 91194940225 + 520432969 = 301985^2 + 22813^2 .

It is a super-2 number, since 2×91715373194² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91715373199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22928843297 + ... + 22928843300.

Almost surely, 2^91715373194 is an apocalyptic number.

91715373194 is a deficient number, since it is larger than the sum of its proper divisors (45857686600).

91715373194 is a wasteful number, since it uses less digits than its factorization.

91715373194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45857686599.

The product of its digits is 714420, while the sum is 50.

The spelling of 91715373194 in words is "ninety-one billion, seven hundred fifteen million, three hundred seventy-three thousand, one hundred ninety-four".