191187138 has 16 divisors (see below), whose sum is σ = 383584320. Its totient is φ = 63527376.

The previous prime is 191187131. The next prime is 191187149. The reversal of 191187138 is 831781191.

191187138 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 191187096 and 191187105.

It is not an unprimeable number, because it can be changed into a prime (191187131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48358 + ... + 52161.

It is an arithmetic number, because the mean of its divisors is an integer number (23974020).

Almost surely, 2^191187138 is an apocalyptic number.

191187138 is an abundant number, since it is smaller than the sum of its proper divisors (192397182).

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

191187138 is a wasteful number, since it uses less digits than its factorization.

191187138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100841.

The product of its digits is 12096, while the sum is 39.

The square root of 191187138 is about 13827.0437187419. The cubic root of 191187138 is about 576.0845446406.

The spelling of 191187138 in words is "one hundred ninety-one million, one hundred eighty-seven thousand, one hundred thirty-eight".