231789139 has 4 divisors (see below), whose sum is σ = 239266240. Its totient is φ = 224312040.

The previous prime is 231789137. The next prime is 231789149. The reversal of 231789139 is 931987132.

231789139 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 231789139 - 2¹ = 231789137 is a prime.

It is a super-2 number, since 2×231789139² = 107452409916722642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231789095 and 231789104.

It is not an unprimeable number, because it can be changed into a prime (231789133) 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, 3738504 + ... + 3738565.

It is an arithmetic number, because the mean of its divisors is an integer number (59816560).

Almost surely, 2^231789139 is an apocalyptic number.

231789139 is a deficient number, since it is larger than the sum of its proper divisors (7477101).

231789139 is an equidigital number, since it uses as much as digits as its factorization.

231789139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7477100.

The product of its digits is 81648, while the sum is 43.

The square root of 231789139 is about 15224.6227867885. The cubic root of 231789139 is about 614.2771501472.

The spelling of 231789139 in words is "two hundred thirty-one million, seven hundred eighty-nine thousand, one hundred thirty-nine".