191439682979 has 2 divisors, whose sum is σ = 191439682980. Its totient is φ = 191439682978.

The previous prime is 191439682961. The next prime is 191439682981. The reversal of 191439682979 is 979286934191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191439682979 - 2¹⁶ = 191439617443 is a prime.

Together with 191439682981, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191439612979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95719841489 + 95719841490.

It is an arithmetic number, because the mean of its divisors is an integer number (95719841490).

Almost surely, 2^191439682979 is an apocalyptic number.

191439682979 is a deficient number, since it is larger than the sum of its proper divisors (1).

191439682979 is an equidigital number, since it uses as much as digits as its factorization.

191439682979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52907904, while the sum is 68.

The spelling of 191439682979 in words is "one hundred ninety-one billion, four hundred thirty-nine million, six hundred eighty-two thousand, nine hundred seventy-nine".