191393994782 has 16 divisors (see below), whose sum is σ = 300858948000. Its totient is φ = 91143393792.

The previous prime is 191393994683. The next prime is 191393994787. The reversal of 191393994782 is 287499393191.

It is a super-2 number, since 2×191393994782² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191393994787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8917907 + ... + 8939342.

It is an arithmetic number, because the mean of its divisors is an integer number (18803684250).

Almost surely, 2^191393994782 is an apocalyptic number.

191393994782 is a deficient number, since it is larger than the sum of its proper divisors (109464953218).

191393994782 is a wasteful number, since it uses less digits than its factorization.

191393994782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17857507.

The product of its digits is 26453952, while the sum is 65.

The spelling of 191393994782 in words is "one hundred ninety-one billion, three hundred ninety-three million, nine hundred ninety-four thousand, seven hundred eighty-two".