138498959 has 2 divisors, whose sum is σ = 138498960. Its totient is φ = 138498958.

The previous prime is 138498953. The next prime is 138498967. The reversal of 138498959 is 959894831.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138498959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138498953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69249479 + 69249480.

It is an arithmetic number, because the mean of its divisors is an integer number (69249480).

Almost surely, 2^138498959 is an apocalyptic number.

138498959 is a deficient number, since it is larger than the sum of its proper divisors (1).

138498959 is an equidigital number, since it uses as much as digits as its factorization.

138498959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2799360, while the sum is 56.

The square root of 138498959 is about 11768.5580680048. The cubic root of 138498959 is about 517.3869889440.

The spelling of 138498959 in words is "one hundred thirty-eight million, four hundred ninety-eight thousand, nine hundred fifty-nine".