91001982 has 16 divisors (see below), whose sum is σ = 191583360. Its totient is φ = 28737432.

The previous prime is 91001959. The next prime is 91001993. The reversal of 91001982 is 28910019.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 399018 + ... + 399245.

It is an arithmetic number, because the mean of its divisors is an integer number (11973960).

Almost surely, 2^91001982 is an apocalyptic number.

91001982 is an abundant number, since it is smaller than the sum of its proper divisors (100581378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91001982 is a wasteful number, since it uses less digits than its factorization.

91001982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798287.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 91001982 is about 9539.4958986311. The cubic root of 91001982 is about 449.7974100423.

The spelling of 91001982 in words is "ninety-one million, one thousand, nine hundred eighty-two".