231897499 has 2 divisors, whose sum is σ = 231897500. Its totient is φ = 231897498.

The previous prime is 231897467. The next prime is 231897503. The reversal of 231897499 is 994798132.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231897499 - 2⁵ = 231897467 is a prime.

It is not a weakly prime, because it can be changed into another prime (231897439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115948749 + 115948750.

It is an arithmetic number, because the mean of its divisors is an integer number (115948750).

Almost surely, 2^231897499 is an apocalyptic number.

231897499 is a deficient number, since it is larger than the sum of its proper divisors (1).

231897499 is an equidigital number, since it uses as much as digits as its factorization.

231897499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 52.

The square root of 231897499 is about 15228.1810798270. The cubic root of 231897499 is about 614.3728588336.

The spelling of 231897499 in words is "two hundred thirty-one million, eight hundred ninety-seven thousand, four hundred ninety-nine".