231720426439 has 2 divisors, whose sum is σ = 231720426440. Its totient is φ = 231720426438.

The previous prime is 231720426407. The next prime is 231720426451. The reversal of 231720426439 is 934624027132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231720426439 - 2⁵ = 231720426407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231720426395 and 231720426404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231720426139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115860213219 + 115860213220.

It is an arithmetic number, because the mean of its divisors is an integer number (115860213220).

Almost surely, 2^231720426439 is an apocalyptic number.

231720426439 is a deficient number, since it is larger than the sum of its proper divisors (1).

231720426439 is an equidigital number, since it uses as much as digits as its factorization.

231720426439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 43.

The spelling of 231720426439 in words is "two hundred thirty-one billion, seven hundred twenty million, four hundred twenty-six thousand, four hundred thirty-nine".