191957365739 has 2 divisors, whose sum is σ = 191957365740. Its totient is φ = 191957365738.

The previous prime is 191957365723. The next prime is 191957365763. The reversal of 191957365739 is 937563759191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 191957365739 - 2⁴ = 191957365723 is a prime.

It is a super-2 number, since 2×191957365739² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (191957365799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95978682869 + 95978682870.

It is an arithmetic number, because the mean of its divisors is an integer number (95978682870).

Almost surely, 2^191957365739 is an apocalyptic number.

191957365739 is a deficient number, since it is larger than the sum of its proper divisors (1).

191957365739 is an equidigital number, since it uses as much as digits as its factorization.

191957365739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48223350, while the sum is 65.

The spelling of 191957365739 in words is "one hundred ninety-one billion, nine hundred fifty-seven million, three hundred sixty-five thousand, seven hundred thirty-nine".