231937897 has 2 divisors, whose sum is σ = 231937898. Its totient is φ = 231937896.

The previous prime is 231937889. The next prime is 231937907. The reversal of 231937897 is 798739132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140754496 + 91183401 = 11864^2 + 9549^2 .

It is a cyclic number.

It is not a de Polignac number, because 231937897 - 2³ = 231937889 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 231937897.

It is not a weakly prime, because it can be changed into another prime (231937837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115968948 + 115968949.

It is an arithmetic number, because the mean of its divisors is an integer number (115968949).

Almost surely, 2^231937897 is an apocalyptic number.

It is an amenable number.

231937897 is a deficient number, since it is larger than the sum of its proper divisors (1).

231937897 is an equidigital number, since it uses as much as digits as its factorization.

231937897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 49.

The square root of 231937897 is about 15229.5074444317. The cubic root of 231937897 is about 614.4085326317.

The spelling of 231937897 in words is "two hundred thirty-one million, nine hundred thirty-seven thousand, eight hundred ninety-seven".