191025649 has 8 divisors (see below), whose sum is σ = 199684800. Its totient is φ = 182396016.

The previous prime is 191025629. The next prime is 191025673. The reversal of 191025649 is 946520191.

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 191025649 - 2⁷ = 191025521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191025619) 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, 6427 + ... + 20575.

It is an arithmetic number, because the mean of its divisors is an integer number (24960600).

Almost surely, 2^191025649 is an apocalyptic number.

It is an amenable number.

191025649 is a deficient number, since it is larger than the sum of its proper divisors (8659151).

191025649 is a wasteful number, since it uses less digits than its factorization.

191025649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14759.

The product of its (nonzero) digits is 19440, while the sum is 37.

The square root of 191025649 is about 13821.2028781868. The cubic root of 191025649 is about 575.9222995514.

The spelling of 191025649 in words is "one hundred ninety-one million, twenty-five thousand, six hundred forty-nine".