91993253431 has 4 divisors (see below), whose sum is σ = 91998083664. Its totient is φ = 91988423200.

The previous prime is 91993253423. The next prime is 91993253459. The reversal of 91993253431 is 13435239919.

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 91993253431 - 2³ = 91993253423 is a prime.

It is a super-2 number, since 2×91993253431² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91993253491) 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, 2386435 + ... + 2424676.

It is an arithmetic number, because the mean of its divisors is an integer number (22999520916).

Almost surely, 2^91993253431 is an apocalyptic number.

91993253431 is a deficient number, since it is larger than the sum of its proper divisors (4830233).

91993253431 is a wasteful number, since it uses less digits than its factorization.

91993253431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830232.

The product of its digits is 787320, while the sum is 49.

The spelling of 91993253431 in words is "ninety-one billion, nine hundred ninety-three million, two hundred fifty-three thousand, four hundred thirty-one".