190981999 has 12 divisors (see below), whose sum is σ = 207192600. Its totient is φ = 175959264.

The previous prime is 190981993. The next prime is 190982003. The reversal of 190981999 is 999189091.

It is not a de Polignac number, because 190981999 - 2⁷ = 190981871 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 (190981993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171657 + ... + 172765.

It is an arithmetic number, because the mean of its divisors is an integer number (17266050).

Almost surely, 2^190981999 is an apocalyptic number.

190981999 is a deficient number, since it is larger than the sum of its proper divisors (16210601).

190981999 is a wasteful number, since it uses less digits than its factorization.

190981999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154 (or 2141 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 55.

The square root of 190981999 is about 13819.6236924165. The cubic root of 190981999 is about 575.8784294856.

The spelling of 190981999 in words is "one hundred ninety million, nine hundred eighty-one thousand, nine hundred ninety-nine".