191231994698 has 16 divisors (see below), whose sum is σ = 287572753440. Its totient is φ = 95374474800.

The previous prime is 191231994697. The next prime is 191231994757. The reversal of 191231994698 is 896499132191.

It is a super-2 number, since 2×191231994698² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191231994698.

It is not an unprimeable number, because it can be changed into a prime (191231994697) 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, 9091013 + ... + 9112023.

It is an arithmetic number, because the mean of its divisors is an integer number (17973297090).

Almost surely, 2^191231994698 is an apocalyptic number.

191231994698 is a deficient number, since it is larger than the sum of its proper divisors (96340758742).

191231994698 is a wasteful number, since it uses less digits than its factorization.

191231994698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32293.

The product of its digits is 7558272, while the sum is 62.

The spelling of 191231994698 in words is "one hundred ninety-one billion, two hundred thirty-one million, nine hundred ninety-four thousand, six hundred ninety-eight".