43231997 has 2 divisors, whose sum is σ = 43231998. Its totient is φ = 43231996.

The previous prime is 43231967. The next prime is 43232009. The reversal of 43231997 is 79913234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38613796 + 4618201 = 6214^2 + 2149^2 .

It is a cyclic number.

It is not a de Polignac number, because 43231997 - 2⁶ = 43231933 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 43231997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43231957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21615998 + 21615999.

It is an arithmetic number, because the mean of its divisors is an integer number (21615999).

Almost surely, 2^43231997 is an apocalyptic number.

It is an amenable number.

43231997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43231997 is an equidigital number, since it uses as much as digits as its factorization.

43231997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40824, while the sum is 38.

The square root of 43231997 is about 6575.1043337730. The cubic root of 43231997 is about 350.9687366467.

The spelling of 43231997 in words is "forty-three million, two hundred thirty-one thousand, nine hundred ninety-seven".