67243997 has 2 divisors, whose sum is σ = 67243998. Its totient is φ = 67243996.

The previous prime is 67243987. The next prime is 67243999. The reversal of 67243997 is 79934276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52041796 + 15202201 = 7214^2 + 3899^2 .

It is a cyclic number.

It is not a de Polignac number, because 67243997 - 2²⁴ = 50466781 is a prime.

Together with 67243999, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67243999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33621998 + 33621999.

It is an arithmetic number, because the mean of its divisors is an integer number (33621999).

Almost surely, 2^67243997 is an apocalyptic number.

It is an amenable number.

67243997 is a deficient number, since it is larger than the sum of its proper divisors (1).

67243997 is an equidigital number, since it uses as much as digits as its factorization.

67243997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 571536, while the sum is 47.

The square root of 67243997 is about 8200.2437158904. The cubic root of 67243997 is about 406.6472503346.

The spelling of 67243997 in words is "sixty-seven million, two hundred forty-three thousand, nine hundred ninety-seven".