91435991331 has 8 divisors (see below), whose sum is σ = 121943203600. Its totient is φ = 60943053312.

The previous prime is 91435991323. The next prime is 91435991369. The reversal of 91435991331 is 13319953419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91435991331 - 2³ = 91435991323 is a prime.

It is a super-2 number, since 2×91435991331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91435991431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3553606 + ... + 3579243.

It is an arithmetic number, because the mean of its divisors is an integer number (15242900450).

Almost surely, 2^91435991331 is an apocalyptic number.

91435991331 is a deficient number, since it is larger than the sum of its proper divisors (30507212269).

91435991331 is a wasteful number, since it uses less digits than its factorization.

91435991331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7137125.

The product of its digits is 393660, while the sum is 48.

The spelling of 91435991331 in words is "ninety-one billion, four hundred thirty-five million, nine hundred ninety-one thousand, three hundred thirty-one".