191039139 has 6 divisors (see below), whose sum is σ = 275945436. Its totient is φ = 127359420.

The previous prime is 191039117. The next prime is 191039141. The reversal of 191039139 is 931930191.

It is not a de Polignac number, because 191039139 - 2¹⁶ = 190973603 is a prime.

It is a super-2 number, since 2×191039139² = 72991905259722642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (191039159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10613277 + ... + 10613294.

It is an arithmetic number, because the mean of its divisors is an integer number (45990906).

Almost surely, 2^191039139 is an apocalyptic number.

191039139 is a deficient number, since it is larger than the sum of its proper divisors (84906297).

191039139 is a wasteful number, since it uses less digits than its factorization.

191039139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21226577 (or 21226574 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The square root of 191039139 is about 13821.6908878762. The cubic root of 191039139 is about 575.9358562108.

The spelling of 191039139 in words is "one hundred ninety-one million, thirty-nine thousand, one hundred thirty-nine".