68979947 has 2 divisors, whose sum is σ = 68979948. Its totient is φ = 68979946.

The previous prime is 68979943. The next prime is 68979949. The reversal of 68979947 is 74997986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68979947 - 2² = 68979943 is a prime.

It is a super-3 number, since 3×68979947³ (a number of 24 digits) contains 333 as substring.

Together with 68979949, 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 (68979943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34489973 + 34489974.

It is an arithmetic number, because the mean of its divisors is an integer number (34489974).

Almost surely, 2^68979947 is an apocalyptic number.

68979947 is a deficient number, since it is larger than the sum of its proper divisors (1).

68979947 is an equidigital number, since it uses as much as digits as its factorization.

68979947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6858432, while the sum is 59.

The square root of 68979947 is about 8305.4167264503. The cubic root of 68979947 is about 410.1168554482.

The spelling of 68979947 in words is "sixty-eight million, nine hundred seventy-nine thousand, nine hundred forty-seven".