43219997 has 2 divisors, whose sum is σ = 43219998. Its totient is φ = 43219996.

The previous prime is 43219991. The next prime is 43220011. The reversal of 43219997 is 79991234.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32024281 + 11195716 = 5659^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 43219997 - 2⁸ = 43219741 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 (43219991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21609998 + 21609999.

It is an arithmetic number, because the mean of its divisors is an integer number (21609999).

Almost surely, 2^43219997 is an apocalyptic number.

It is an amenable number.

43219997 is a deficient number, since it is larger than the sum of its proper divisors (1).

43219997 is an equidigital number, since it uses as much as digits as its factorization.

43219997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 44.

The square root of 43219997 is about 6574.1917373925. The cubic root of 43219997 is about 350.9362605883.

The spelling of 43219997 in words is "forty-three million, two hundred nineteen thousand, nine hundred ninety-seven".