231989099 has 2 divisors, whose sum is σ = 231989100. Its totient is φ = 231989098.

The previous prime is 231989081. The next prime is 231989117. The reversal of 231989099 is 990989132.

It is a balanced prime because it is at equal distance from previous prime (231989081) and next prime (231989117).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231989099 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (231989059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115994549 + 115994550.

It is an arithmetic number, because the mean of its divisors is an integer number (115994550).

Almost surely, 2^231989099 is an apocalyptic number.

231989099 is a deficient number, since it is larger than the sum of its proper divisors (1).

231989099 is an equidigital number, since it uses as much as digits as its factorization.

231989099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 231989099 is about 15231.1883646681. The cubic root of 231989099 is about 614.4537410423.

The spelling of 231989099 in words is "two hundred thirty-one million, nine hundred eighty-nine thousand, ninety-nine".