91039950 has 144 divisors (see below), whose sum is σ = 259983360. Its totient is φ = 23677920.

The previous prime is 91039933. The next prime is 91039997. The reversal of 91039950 is 5993019.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 716787 + ... + 716913.

It is an arithmetic number, because the mean of its divisors is an integer number (1805440).

Almost surely, 2^91039950 is an apocalyptic number.

91039950 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 91039950, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129991680).

91039950 is an abundant number, since it is smaller than the sum of its proper divisors (168943410).

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

91039950 is a wasteful number, since it uses less digits than its factorization.

91039950 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 91039950 is about 9541.4857333646. The cubic root of 91039950 is about 449.8599564218.

The spelling of 91039950 in words is "ninety-one million, thirty-nine thousand, nine hundred fifty".