191039964 has 12 divisors (see below), whose sum is σ = 445759944. Its totient is φ = 63679984.

The previous prime is 191039957. The next prime is 191039987. The reversal of 191039964 is 469930191.

191039964 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7959987 + ... + 7960010.

It is an arithmetic number, because the mean of its divisors is an integer number (37146662).

Almost surely, 2^191039964 is an apocalyptic number.

It is an amenable number.

191039964 is an abundant number, since it is smaller than the sum of its proper divisors (254719980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191039964 is a wasteful number, since it uses less digits than its factorization.

191039964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15920004 (or 15920002 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 191039964 is about 13821.7207322388. The cubic root of 191039964 is about 575.9366852667.

The spelling of 191039964 in words is "one hundred ninety-one million, thirty-nine thousand, nine hundred sixty-four".