191812157 has 8 divisors (see below), whose sum is σ = 200841984. Its totient is φ = 182839888.

The previous prime is 191812147. The next prime is 191812169. The reversal of 191812157 is 751218191.

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

It is a cyclic number.

It is not a de Polignac number, because 191812157 - 2²² = 187617853 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 (191812147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7493 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (25105248).

Almost surely, 2^191812157 is an apocalyptic number.

It is an amenable number.

191812157 is a deficient number, since it is larger than the sum of its proper divisors (9029827).

191812157 is a wasteful number, since it uses less digits than its factorization.

191812157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28779.

The product of its digits is 5040, while the sum is 35.

The square root of 191812157 is about 13849.6266014647. The cubic root of 191812157 is about 576.7116302866.

The spelling of 191812157 in words is "one hundred ninety-one million, eight hundred twelve thousand, one hundred fifty-seven".