191880139 has 16 divisors (see below), whose sum is σ = 222082560. Its totient is φ = 163845760.

The previous prime is 191880119. The next prime is 191880151. The reversal of 191880139 is 931088191.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 191880139 - 2⁷ = 191880011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (191880119) 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, 156282 + ... + 157504.

It is an arithmetic number, because the mean of its divisors is an integer number (13880160).

Almost surely, 2^191880139 is an apocalyptic number.

191880139 is a deficient number, since it is larger than the sum of its proper divisors (30202421).

191880139 is a wasteful number, since it uses less digits than its factorization.

191880139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090.

The product of its (nonzero) digits is 15552, while the sum is 40.

The square root of 191880139 is about 13852.0806740359. The cubic root of 191880139 is about 576.7797548862.

The spelling of 191880139 in words is "one hundred ninety-one million, eight hundred eighty thousand, one hundred thirty-nine".