191992902 has 8 divisors (see below), whose sum is σ = 383985816. Its totient is φ = 63997632.

The previous prime is 191992901. The next prime is 191992943. The reversal of 191992902 is 209299191.

It is a sphenic number, since it is the product of 3 distinct primes.

191992902 is an admirable number.

It is a super-2 number, since 2×191992902² = 73722548836763208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191992901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15999403 + ... + 15999414.

It is an arithmetic number, because the mean of its divisors is an integer number (47998227).

Almost surely, 2^191992902 is an apocalyptic number.

191992902 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

191992902 is a wasteful number, since it uses less digits than its factorization.

191992902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31998822.

The product of its (nonzero) digits is 26244, while the sum is 42.

The square root of 191992902 is about 13856.1503311706. The cubic root of 191992902 is about 576.8927189468.

The spelling of 191992902 in words is "one hundred ninety-one million, nine hundred ninety-two thousand, nine hundred two".