191939945 has 16 divisors (see below), whose sum is σ = 254482560. Its totient is φ = 138234624.

The previous prime is 191939903. The next prime is 191939959. The reversal of 191939945 is 549939191.

It is a happy number.

191939945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 191939945 - 2⁸ = 191939689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 191939893 and 191939902.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47135 + ... + 51044.

It is an arithmetic number, because the mean of its divisors is an integer number (15905160).

Almost surely, 2^191939945 is an apocalyptic number.

It is an amenable number.

191939945 is a deficient number, since it is larger than the sum of its proper divisors (62542615).

191939945 is a wasteful number, since it uses less digits than its factorization.

191939945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98224.

The product of its digits is 393660, while the sum is 50.

The square root of 191939945 is about 13854.2392429177. The cubic root of 191939945 is about 576.8396730326.

The spelling of 191939945 in words is "one hundred ninety-one million, nine hundred thirty-nine thousand, nine hundred forty-five".