138517559 has 2 divisors, whose sum is σ = 138517560. Its totient is φ = 138517558.

The previous prime is 138517501. The next prime is 138517583. The reversal of 138517559 is 955715831.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138517559 is a prime.

It is a super-2 number, since 2×138517559² = 38374228302636962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138517759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69258779 + 69258780.

It is an arithmetic number, because the mean of its divisors is an integer number (69258780).

Almost surely, 2^138517559 is an apocalyptic number.

138517559 is a deficient number, since it is larger than the sum of its proper divisors (1).

138517559 is an equidigital number, since it uses as much as digits as its factorization.

138517559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 189000, while the sum is 44.

The square root of 138517559 is about 11769.3482827215. The cubic root of 138517559 is about 517.4101490874.

The spelling of 138517559 in words is "one hundred thirty-eight million, five hundred seventeen thousand, five hundred fifty-nine".