67971613 has 2 divisors, whose sum is σ = 67971614. Its totient is φ = 67971612.

The previous prime is 67971611. The next prime is 67971649. The reversal of 67971613 is 31617976.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64593369 + 3378244 = 8037^2 + 1838^2 .

It is a cyclic number.

It is not a de Polignac number, because 67971613 - 2¹ = 67971611 is a prime.

Together with 67971611, 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 (67971611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33985806 + 33985807.

It is an arithmetic number, because the mean of its divisors is an integer number (33985807).

Almost surely, 2^67971613 is an apocalyptic number.

It is an amenable number.

67971613 is a deficient number, since it is larger than the sum of its proper divisors (1).

67971613 is an equidigital number, since it uses as much as digits as its factorization.

67971613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 40.

The square root of 67971613 is about 8244.4898568680. The cubic root of 67971613 is about 408.1087052554.

The spelling of 67971613 in words is "sixty-seven million, nine hundred seventy-one thousand, six hundred thirteen".