91818473731 has 8 divisors (see below), whose sum is σ = 97141643280. Its totient is φ = 86544366048.

The previous prime is 91818473717. The next prime is 91818473737. The reversal of 91818473731 is 13737481819.

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

It is a cyclic number.

It is not a de Polignac number, because 91818473731 - 2⁷ = 91818473603 is a prime.

It is a super-2 number, since 2×91818473731² (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 (91818473737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12261616 + ... + 12269101.

It is an arithmetic number, because the mean of its divisors is an integer number (12142705410).

Almost surely, 2^91818473731 is an apocalyptic number.

91818473731 is a deficient number, since it is larger than the sum of its proper divisors (5323169549).

91818473731 is a wasteful number, since it uses less digits than its factorization.

91818473731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24530933.

The product of its digits is 1016064, while the sum is 52.

The spelling of 91818473731 in words is "ninety-one billion, eight hundred eighteen million, four hundred seventy-three thousand, seven hundred thirty-one".