231005389 has 2 divisors, whose sum is σ = 231005390. Its totient is φ = 231005388.

The previous prime is 231005381. The next prime is 231005419. The reversal of 231005389 is 983500132.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 172712164 + 58293225 = 13142^2 + 7635^2 .

It is a cyclic number.

It is not a de Polignac number, because 231005389 - 2³ = 231005381 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231005389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231005381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115502694 + 115502695.

It is an arithmetic number, because the mean of its divisors is an integer number (115502695).

Almost surely, 2^231005389 is an apocalyptic number.

It is an amenable number.

231005389 is a deficient number, since it is larger than the sum of its proper divisors (1).

231005389 is an equidigital number, since it uses as much as digits as its factorization.

231005389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 231005389 is about 15198.8614376209. The cubic root of 231005389 is about 613.5840153267.

The spelling of 231005389 in words is "two hundred thirty-one million, five thousand, three hundred eighty-nine".