191225907 has 16 divisors (see below), whose sum is σ = 283898880. Its totient is φ = 127213416.

The previous prime is 191225893. The next prime is 191225917. The reversal of 191225907 is 709522191.

191225907 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191225907 - 2⁷ = 191225779 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191225917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5878 + ... + 20420.

It is an arithmetic number, because the mean of its divisors is an integer number (17743680).

Almost surely, 2^191225907 is an apocalyptic number.

191225907 is a deficient number, since it is larger than the sum of its proper divisors (92672973).

191225907 is a wasteful number, since it uses less digits than its factorization.

191225907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15039 (or 15033 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 191225907 is about 13828.4455742502. The cubic root of 191225907 is about 576.1234815559.

The spelling of 191225907 in words is "one hundred ninety-one million, two hundred twenty-five thousand, nine hundred seven".