191430982409 has 2 divisors, whose sum is σ = 191430982410. Its totient is φ = 191430982408.

The previous prime is 191430982387. The next prime is 191430982471. The reversal of 191430982409 is 904289034191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120006816400 + 71424166009 = 346420^2 + 267253^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191430982409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (191430982109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95715491204 + 95715491205.

It is an arithmetic number, because the mean of its divisors is an integer number (95715491205).

Almost surely, 2^191430982409 is an apocalyptic number.

It is an amenable number.

191430982409 is a deficient number, since it is larger than the sum of its proper divisors (1).

191430982409 is an equidigital number, since it uses as much as digits as its factorization.

191430982409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The spelling of 191430982409 in words is "one hundred ninety-one billion, four hundred thirty million, nine hundred eighty-two thousand, four hundred nine".