231435389 has 2 divisors, whose sum is σ = 231435390. Its totient is φ = 231435388.

The previous prime is 231435317. The next prime is 231435397. The reversal of 231435389 is 983534132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221563225 + 9872164 = 14885^2 + 3142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231435389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231435089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115717694 + 115717695.

It is an arithmetic number, because the mean of its divisors is an integer number (115717695).

Almost surely, 2^231435389 is an apocalyptic number.

It is an amenable number.

231435389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231435389 is an equidigital number, since it uses as much as digits as its factorization.

231435389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 231435389 is about 15213.0006573325. Note that the first 3 decimals coincide. The cubic root of 231435389 is about 613.9644935913.

The spelling of 231435389 in words is "two hundred thirty-one million, four hundred thirty-five thousand, three hundred eighty-nine".