990358191 has 8 divisors (see below), whose sum is σ = 1467197360. Its totient is φ = 660238776.

The previous prime is 990358183. The next prime is 990358253. The reversal of 990358191 is 191853099.

It is not a de Polignac number, because 990358191 - 2³ = 990358183 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990358591) 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, 18339940 + ... + 18339993.

It is an arithmetic number, because the mean of its divisors is an integer number (183399670).

Almost surely, 2^990358191 is an apocalyptic number.

990358191 is a deficient number, since it is larger than the sum of its proper divisors (476839169).

990358191 is a wasteful number, since it uses less digits than its factorization.

990358191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36679942 (or 36679936 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 990358191 is about 31469.9569589791. The cubic root of 990358191 is about 996.7756785917.

The spelling of 990358191 in words is "nine hundred ninety million, three hundred fifty-eight thousand, one hundred ninety-one".