191642493 has 32 divisors (see below), whose sum is σ = 308362240. Its totient is φ = 103420800.

The previous prime is 191642491. The next prime is 191642501. The reversal of 191642493 is 394246191.

It is not a de Polignac number, because 191642493 - 2¹ = 191642491 is a prime.

It is the 13844-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191642491) by changing a digit.

It is a nontrivial repunit in base 13843.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 181818 + ... + 182868.

It is an arithmetic number, because the mean of its divisors is an integer number (9636320).

Almost surely, 2^191642493 is an apocalyptic number.

It is an amenable number.

191642493 is a deficient number, since it is larger than the sum of its proper divisors (116719747).

191642493 is a wasteful number, since it uses less digits than its factorization.

191642493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537.

The product of its digits is 46656, while the sum is 39.

The square root of 191642493 is about 13843.5000270885. The cubic root of 191642493 is about 576.5415401536.

The spelling of 191642493 in words is "one hundred ninety-one million, six hundred forty-two thousand, four hundred ninety-three".