231989117 has 2 divisors, whose sum is σ = 231989118. Its totient is φ = 231989116.

The previous prime is 231989099. The next prime is 231989143. The reversal of 231989117 is 711989132.

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., 168324676 + 63664441 = 12974^2 + 7979^2 .

It is a cyclic number.

It is not a de Polignac number, because 231989117 - 2⁶ = 231989053 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 (231989167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115994558 + 115994559.

It is an arithmetic number, because the mean of its divisors is an integer number (115994559).

Almost surely, 2^231989117 is an apocalyptic number.

It is an amenable number.

231989117 is a deficient number, since it is larger than the sum of its proper divisors (1).

231989117 is an equidigital number, since it uses as much as digits as its factorization.

231989117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 231989117 is about 15231.1889555609. The cubic root of 231989117 is about 614.4537569341.

The spelling of 231989117 in words is "two hundred thirty-one million, nine hundred eighty-nine thousand, one hundred seventeen".