191812902274 has 12 divisors (see below), whose sum is σ = 334693941894. Its totient is φ = 82205529504.

The previous prime is 191812902247. The next prime is 191812902299. The reversal of 191812902274 is 472209218191.

It can be written as a sum of positive squares in only one way, i.e., 189238050225 + 2574852049 = 435015^2 + 50743^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 978637159 + ... + 978637354.

Almost surely, 2^191812902274 is an apocalyptic number.

191812902274 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

191812902274 is a deficient number, since it is larger than the sum of its proper divisors (142881039620).

191812902274 is a wasteful number, since it uses less digits than its factorization.

191812902274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957274529 (or 1957274522 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 191812902274 in words is "one hundred ninety-one billion, eight hundred twelve million, nine hundred two thousand, two hundred seventy-four".