191647649 has 8 divisors (see below), whose sum is σ = 193130880. Its totient is φ = 190169856.

The previous prime is 191647639. The next prime is 191647691. The reversal of 191647649 is 946746191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191647649 - 2⁴ = 191647633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191647609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 92972 + ... + 95010.

It is an arithmetic number, because the mean of its divisors is an integer number (24141360).

Almost surely, 2^191647649 is an apocalyptic number.

It is an amenable number.

191647649 is a deficient number, since it is larger than the sum of its proper divisors (1483231).

191647649 is a wasteful number, since it uses less digits than its factorization.

191647649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2719.

The product of its digits is 326592, while the sum is 47.

The square root of 191647649 is about 13843.6862504176. The cubic root of 191647649 is about 576.5467105823.

The spelling of 191647649 in words is "one hundred ninety-one million, six hundred forty-seven thousand, six hundred forty-nine".