91485788431 has 4 divisors (see below), whose sum is σ = 91489113792. Its totient is φ = 91482463072.

The previous prime is 91485788419. The next prime is 91485788441. The reversal of 91485788431 is 13488758419.

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 91485788431 - 2²¹ = 91483691279 is a prime.

It is a super-2 number, since 2×91485788431² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91485788441) 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, 1621066 + ... + 1676551.

It is an arithmetic number, because the mean of its divisors is an integer number (22872278448).

Almost surely, 2^91485788431 is an apocalyptic number.

91485788431 is a deficient number, since it is larger than the sum of its proper divisors (3325361).

91485788431 is a wasteful number, since it uses less digits than its factorization.

91485788431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325360.

The product of its digits is 7741440, while the sum is 58.

The spelling of 91485788431 in words is "ninety-one billion, four hundred eighty-five million, seven hundred eighty-eight thousand, four hundred thirty-one".