231847997 has 2 divisors, whose sum is σ = 231847998. Its totient is φ = 231847996.

The previous prime is 231847961. The next prime is 231848009. The reversal of 231847997 is 799748132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 190964761 + 40883236 = 13819^2 + 6394^2 .

It is a cyclic number.

It is not a de Polignac number, because 231847997 - 2⁶ = 231847933 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 (231847097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115923998 + 115923999.

It is an arithmetic number, because the mean of its divisors is an integer number (115923999).

Almost surely, 2^231847997 is an apocalyptic number.

It is an amenable number.

231847997 is a deficient number, since it is larger than the sum of its proper divisors (1).

231847997 is an equidigital number, since it uses as much as digits as its factorization.

231847997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 762048, while the sum is 50.

The square root of 231847997 is about 15226.5556512299. Note that the first 3 decimals coincide. The cubic root of 231847997 is about 614.3291400215.

The spelling of 231847997 in words is "two hundred thirty-one million, eight hundred forty-seven thousand, nine hundred ninety-seven".