191690023 has 6 divisors (see below), whose sum is σ = 219116184. Its totient is φ = 164274336.

The previous prime is 191689991. The next prime is 191690039. The reversal of 191690023 is 320096191.

It is not a de Polignac number, because 191690023 - 2⁵ = 191689991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191690923) 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 5 ways as a sum of consecutive naturals, for example, 34015 + ... + 39247.

It is an arithmetic number, because the mean of its divisors is an integer number (36519364).

Almost surely, 2^191690023 is an apocalyptic number.

191690023 is a deficient number, since it is larger than the sum of its proper divisors (27426161).

191690023 is an frugal number, since it uses more digits than its factorization.

191690023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10473 (or 5240 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 191690023 is about 13845.2166108010. The cubic root of 191690023 is about 576.5891996503.

The spelling of 191690023 in words is "one hundred ninety-one million, six hundred ninety thousand, twenty-three".