67981619 has 2 divisors, whose sum is σ = 67981620. Its totient is φ = 67981618.

The previous prime is 67981603. The next prime is 67981621. The reversal of 67981619 is 91618976.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 67981619 - 2⁴ = 67981603 is a prime.

It is a super-2 number, since 2×67981619² = 9243001043722322, which contains 22 as substring.

Together with 67981621, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67981679) 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, 33990809 + 33990810.

It is an arithmetic number, because the mean of its divisors is an integer number (33990810).

Almost surely, 2^67981619 is an apocalyptic number.

67981619 is a deficient number, since it is larger than the sum of its proper divisors (1).

67981619 is an equidigital number, since it uses as much as digits as its factorization.

67981619 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 47.

The square root of 67981619 is about 8245.0966640786. The cubic root of 67981619 is about 408.1287299646.

The spelling of 67981619 in words is "sixty-seven million, nine hundred eighty-one thousand, six hundred nineteen".