191604851 has 2 divisors, whose sum is σ = 191604852. Its totient is φ = 191604850.

The previous prime is 191604821. The next prime is 191604857. The reversal of 191604851 is 158406191.

It is a strong prime.

It is an emirp because it is prime and its reverse (158406191) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191604851 is a prime.

It is not a weakly prime, because it can be changed into another prime (191604857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95802425 + 95802426.

It is an arithmetic number, because the mean of its divisors is an integer number (95802426).

Almost surely, 2^191604851 is an apocalyptic number.

191604851 is a deficient number, since it is larger than the sum of its proper divisors (1).

191604851 is an equidigital number, since it uses as much as digits as its factorization.

191604851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 191604851 is about 13842.1404052986. The cubic root of 191604851 is about 576.5037900051.

The spelling of 191604851 in words is "one hundred ninety-one million, six hundred four thousand, eight hundred fifty-one".