91939712398 has 4 divisors (see below), whose sum is σ = 137909568600. Its totient is φ = 45969856198.

The previous prime is 91939712393. The next prime is 91939712437. The reversal of 91939712398 is 89321793919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89321793919 = 1187 ⋅75250037.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939712393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22984928098 + ... + 22984928101.

It is an arithmetic number, because the mean of its divisors is an integer number (34477392150).

Almost surely, 2^91939712398 is an apocalyptic number.

91939712398 is a deficient number, since it is larger than the sum of its proper divisors (45969856202).

91939712398 is a wasteful number, since it uses less digits than its factorization.

91939712398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45969856201.

The product of its digits is 6613488, while the sum is 61.

The spelling of 91939712398 in words is "ninety-one billion, nine hundred thirty-nine million, seven hundred twelve thousand, three hundred ninety-eight".