231240389 has 2 divisors, whose sum is σ = 231240390. Its totient is φ = 231240388.

The previous prime is 231240371. The next prime is 231240419. The reversal of 231240389 is 983042132.

It is a happy number.

231240389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220017889 + 11222500 = 14833^2 + 3350^2 .

It is a cyclic number.

It is not a de Polignac number, because 231240389 - 2¹² = 231236293 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 (231260389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115620194 + 115620195.

It is an arithmetic number, because the mean of its divisors is an integer number (115620195).

Almost surely, 2^231240389 is an apocalyptic number.

It is an amenable number.

231240389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231240389 is an equidigital number, since it uses as much as digits as its factorization.

231240389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 231240389 is about 15206.5903147287. The cubic root of 231240389 is about 613.7920095740.

The spelling of 231240389 in words is "two hundred thirty-one million, two hundred forty thousand, three hundred eighty-nine".