191891634 has 32 divisors (see below), whose sum is σ = 419164416. Its totient is φ = 58080720.

The previous prime is 191891633. The next prime is 191891677. The reversal of 191891634 is 436198191.

It is not an unprimeable number, because it can be changed into a prime (191891633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106489 + ... + 108275.

It is an arithmetic number, because the mean of its divisors is an integer number (13098888).

Almost surely, 2^191891634 is an apocalyptic number.

191891634 is an abundant number, since it is smaller than the sum of its proper divisors (227272782).

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

191891634 is a wasteful number, since it uses less digits than its factorization.

191891634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430.

The product of its digits is 46656, while the sum is 42.

The square root of 191891634 is about 13852.4955874384. The cubic root of 191891634 is about 576.7912724077.

The spelling of 191891634 in words is "one hundred ninety-one million, eight hundred ninety-one thousand, six hundred thirty-four".