91312203331 has 4 divisors (see below), whose sum is σ = 95282299152. Its totient is φ = 87342107512.

The previous prime is 91312203289. The next prime is 91312203347. The reversal of 91312203331 is 13330221319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13330221319 = 48527 ⋅274697.

It is a cyclic number.

It is not a de Polignac number, because 91312203331 - 2¹¹ = 91312201283 is a prime.

It is a super-2 number, since 2×91312203331² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91312203331.

It is not an unprimeable number, because it can be changed into a prime (91312203361) 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, 1985047876 + ... + 1985047921.

It is an arithmetic number, because the mean of its divisors is an integer number (23820574788).

Almost surely, 2^91312203331 is an apocalyptic number.

91312203331 is a deficient number, since it is larger than the sum of its proper divisors (3970095821).

91312203331 is a wasteful number, since it uses less digits than its factorization.

91312203331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970095820.

The product of its (nonzero) digits is 2916, while the sum is 28.

The spelling of 91312203331 in words is "ninety-one billion, three hundred twelve million, two hundred three thousand, three hundred thirty-one".