191793649 has 4 divisors (see below), whose sum is σ = 194495040. Its totient is φ = 189092260.

The previous prime is 191793629. The next prime is 191793653. The reversal of 191793649 is 946397191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 191793649 - 2⁹ = 191793137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191793629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1350589 + ... + 1350730.

It is an arithmetic number, because the mean of its divisors is an integer number (48623760).

Almost surely, 2^191793649 is an apocalyptic number.

It is an amenable number.

191793649 is a deficient number, since it is larger than the sum of its proper divisors (2701391).

191793649 is an equidigital number, since it uses as much as digits as its factorization.

191793649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701390.

The product of its digits is 367416, while the sum is 49.

The square root of 191793649 is about 13848.9584084869. The cubic root of 191793649 is about 576.6930806765.

The spelling of 191793649 in words is "one hundred ninety-one million, seven hundred ninety-three thousand, six hundred forty-nine".