91999050 has 96 divisors (see below), whose sum is σ = 268107840. Its totient is φ = 20582400.

The previous prime is 91999027. The next prime is 91999051. The reversal of 91999050 is 5099919.

It is a junction number, because it is equal to n+sod(n) for n = 91998993 and 91999011.

It is not an unprimeable number, because it can be changed into a prime (91999051) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19306 + ... + 23594.

It is an arithmetic number, because the mean of its divisors is an integer number (2792790).

Almost surely, 2^91999050 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91999050, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134053920).

91999050 is an abundant number, since it is smaller than the sum of its proper divisors (176108790).

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

91999050 is a wasteful number, since it uses less digits than its factorization.

91999050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4328 (or 4323 counting only the distinct ones).

The product of its (nonzero) digits is 32805, while the sum is 42.

The square root of 91999050 is about 9591.6135243243. The cubic root of 91999050 is about 451.4341896871.

The spelling of 91999050 in words is "ninety-one million, nine hundred ninety-nine thousand, fifty".