139530191 has 4 divisors (see below), whose sum is σ = 140454384. Its totient is φ = 138606000.

The previous prime is 139530173. The next prime is 139530197. The reversal of 139530191 is 191035931.

It is a happy number.

139530191 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.

It is a cyclic number.

It is not a de Polignac number, because 139530191 - 2¹⁰ = 139529167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139530197) 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, 461870 + ... + 462171.

It is an arithmetic number, because the mean of its divisors is an integer number (35113596).

Almost surely, 2^139530191 is an apocalyptic number.

139530191 is a deficient number, since it is larger than the sum of its proper divisors (924193).

139530191 is an equidigital number, since it uses as much as digits as its factorization.

139530191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924192.

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 139530191 is about 11812.2898288181. The cubic root of 139530191 is about 518.6679305790.

The spelling of 139530191 in words is "one hundred thirty-nine million, five hundred thirty thousand, one hundred ninety-one".