91408972249 has 16 divisors (see below), whose sum is σ = 105372979200. Its totient is φ = 77672335104.

The previous prime is 91408972211. The next prime is 91408972253. The reversal of 91408972249 is 94227980419.

It is a happy number.

It is not a de Polignac number, because 91408972249 - 2²³ = 91400583641 is a prime.

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 91408972249.

It is not an unprimeable number, because it can be changed into a prime (91408972349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1106037 + ... + 1185805.

It is an arithmetic number, because the mean of its divisors is an integer number (6585811200).

Almost surely, 2^91408972249 is an apocalyptic number.

It is an amenable number.

91408972249 is a deficient number, since it is larger than the sum of its proper divisors (13964006951).

91408972249 is a wasteful number, since it uses less digits than its factorization.

91408972249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81192.

The product of its (nonzero) digits is 2612736, while the sum is 55.

The spelling of 91408972249 in words is "ninety-one billion, four hundred eight million, nine hundred seventy-two thousand, two hundred forty-nine".