191981742 has 8 divisors (see below), whose sum is σ = 383963496. Its totient is φ = 63993912.

The previous prime is 191981651. The next prime is 191981753. The reversal of 191981742 is 247189191.

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

191981742 is an admirable number.

It is a super-2 number, since 2×191981742² = 73713978522709128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191981694 and 191981703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15998473 + ... + 15998484.

It is an arithmetic number, because the mean of its divisors is an integer number (47995437).

Almost surely, 2^191981742 is an apocalyptic number.

191981742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

191981742 is a wasteful number, since it uses less digits than its factorization.

191981742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31996962.

The product of its digits is 36288, while the sum is 42.

The square root of 191981742 is about 13855.7476160617. The cubic root of 191981742 is about 576.8815410206.

The spelling of 191981742 in words is "one hundred ninety-one million, nine hundred eighty-one thousand, seven hundred forty-two".