191929109107 has 2 divisors, whose sum is σ = 191929109108. Its totient is φ = 191929109106.

The previous prime is 191929109069. The next prime is 191929109131. The reversal of 191929109107 is 701901929191.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191929109107 is a prime.

It is not a weakly prime, because it can be changed into another prime (191929109137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95964554553 + 95964554554.

It is an arithmetic number, because the mean of its divisors is an integer number (95964554554).

Almost surely, 2^191929109107 is an apocalyptic number.

191929109107 is a deficient number, since it is larger than the sum of its proper divisors (1).

191929109107 is an equidigital number, since it uses as much as digits as its factorization.

191929109107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 49.

The spelling of 191929109107 in words is "one hundred ninety-one billion, nine hundred twenty-nine million, one hundred nine thousand, one hundred seven".