191304493 has 2 divisors, whose sum is σ = 191304494. Its totient is φ = 191304492.

The previous prime is 191304473. The next prime is 191304499. The reversal of 191304493 is 394403191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185558884 + 5745609 = 13622^2 + 2397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191304493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191304499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95652246 + 95652247.

It is an arithmetic number, because the mean of its divisors is an integer number (95652247).

Almost surely, 2^191304493 is an apocalyptic number.

It is an amenable number.

191304493 is a deficient number, since it is larger than the sum of its proper divisors (1).

191304493 is an equidigital number, since it uses as much as digits as its factorization.

191304493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 191304493 is about 13831.2867441898. The cubic root of 191304493 is about 576.2023917830.

The spelling of 191304493 in words is "one hundred ninety-one million, three hundred four thousand, four hundred ninety-three".