191225649 has 16 divisors (see below), whose sum is σ = 259282944. Its totient is φ = 125336400.

The previous prime is 191225641. The next prime is 191225653. The reversal of 191225649 is 946522191.

It is not a de Polignac number, because 191225649 - 2³ = 191225641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191225641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90762 + ... + 92844.

It is an arithmetic number, because the mean of its divisors is an integer number (16205184).

Almost surely, 2^191225649 is an apocalyptic number.

It is an amenable number.

191225649 is a deficient number, since it is larger than the sum of its proper divisors (68057295).

191225649 is a wasteful number, since it uses less digits than its factorization.

191225649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2588.

The product of its digits is 38880, while the sum is 39.

The square root of 191225649 is about 13828.4362456498. The cubic root of 191225649 is about 576.1232224559.

The spelling of 191225649 in words is "one hundred ninety-one million, two hundred twenty-five thousand, six hundred forty-nine".