138616979 has 2 divisors, whose sum is σ = 138616980. Its totient is φ = 138616978.

The previous prime is 138616967. The next prime is 138616991. The reversal of 138616979 is 979616831.

It is a balanced prime because it is at equal distance from previous prime (138616967) and next prime (138616991).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138616979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138616939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69308489 + 69308490.

It is an arithmetic number, because the mean of its divisors is an integer number (69308490).

Almost surely, 2^138616979 is an apocalyptic number.

138616979 is a deficient number, since it is larger than the sum of its proper divisors (1).

138616979 is an equidigital number, since it uses as much as digits as its factorization.

138616979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 50.

The square root of 138616979 is about 11773.5712084312. The cubic root of 138616979 is about 517.5339086434.

The spelling of 138616979 in words is "one hundred thirty-eight million, six hundred sixteen thousand, nine hundred seventy-nine".