67997509 has 2 divisors, whose sum is σ = 67997510. Its totient is φ = 67997508.

The previous prime is 67997507. The next prime is 67997521. The reversal of 67997509 is 90579976.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 2030625 = 8122^2 + 1425^2 .

It is a cyclic number.

It is not a de Polignac number, because 67997509 - 2¹ = 67997507 is a prime.

It is a super-2 number, since 2×67997509² = 9247322460410162, which contains 22 as substring.

Together with 67997507, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67997507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33998754 + 33998755.

It is an arithmetic number, because the mean of its divisors is an integer number (33998755).

Almost surely, 2^67997509 is an apocalyptic number.

It is an amenable number.

67997509 is a deficient number, since it is larger than the sum of its proper divisors (1).

67997509 is an equidigital number, since it uses as much as digits as its factorization.

67997509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1071630, while the sum is 52.

The square root of 67997509 is about 8246.0602107916. The cubic root of 67997509 is about 408.1605261099.

The spelling of 67997509 in words is "sixty-seven million, nine hundred ninety-seven thousand, five hundred nine".