91280440731 has 8 divisors (see below), whose sum is σ = 121757123664. Its totient is φ = 60828692480.

The previous prime is 91280440673. The next prime is 91280440759. The reversal of 91280440731 is 13704408219.

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 91280440731 - 2⁹ = 91280440219 is a prime.

It is a super-2 number, since 2×91280440731² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 91280440731.

It is not an unprimeable number, because it can be changed into a prime (91280440831) 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, 6225126 + ... + 6239771.

It is an arithmetic number, because the mean of its divisors is an integer number (15219640458).

Almost surely, 2^91280440731 is an apocalyptic number.

91280440731 is a deficient number, since it is larger than the sum of its proper divisors (30476682933).

91280440731 is a wasteful number, since it uses less digits than its factorization.

91280440731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12467341.

The product of its (nonzero) digits is 48384, while the sum is 39.

The spelling of 91280440731 in words is "ninety-one billion, two hundred eighty million, four hundred forty thousand, seven hundred thirty-one".