139191187 has 4 divisors (see below), whose sum is σ = 142586136. Its totient is φ = 135796240.

The previous prime is 139191167. The next prime is 139191191. The reversal of 139191187 is 781191931.

139191187 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 781191931 = 13 ⋅60091687.

It is a cyclic number.

It is not a de Polignac number, because 139191187 - 2¹¹ = 139189139 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139191137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1697413 + ... + 1697494.

It is an arithmetic number, because the mean of its divisors is an integer number (35646534).

Almost surely, 2^139191187 is an apocalyptic number.

139191187 is a deficient number, since it is larger than the sum of its proper divisors (3394949).

139191187 is an equidigital number, since it uses as much as digits as its factorization.

139191187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394948.

The product of its digits is 13608, while the sum is 40.

The square root of 139191187 is about 11797.9314712368. The cubic root of 139191187 is about 518.2475362680.

The spelling of 139191187 in words is "one hundred thirty-nine million, one hundred ninety-one thousand, one hundred eighty-seven".