138510979 has 2 divisors, whose sum is σ = 138510980. Its totient is φ = 138510978.

The previous prime is 138510971. The next prime is 138511027. The reversal of 138510979 is 979015831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138510979 - 2³ = 138510971 is a prime.

It is not a weakly prime, because it can be changed into another prime (138510971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69255489 + 69255490.

It is an arithmetic number, because the mean of its divisors is an integer number (69255490).

Almost surely, 2^138510979 is an apocalyptic number.

138510979 is a deficient number, since it is larger than the sum of its proper divisors (1).

138510979 is an equidigital number, since it uses as much as digits as its factorization.

138510979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 43.

The square root of 138510979 is about 11769.0687397092. The cubic root of 138510979 is about 517.4019561124.

The spelling of 138510979 in words is "one hundred thirty-eight million, five hundred ten thousand, nine hundred seventy-nine".