138242659 has 2 divisors, whose sum is σ = 138242660. Its totient is φ = 138242658.

The previous prime is 138242633. The next prime is 138242669. The reversal of 138242659 is 956242831.

138242659 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (956242831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138242659 - 2¹⁵ = 138209891 is a prime.

It is a super-2 number, since 2×138242659² = 38222065534780562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138242669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69121329 + 69121330.

It is an arithmetic number, because the mean of its divisors is an integer number (69121330).

Almost surely, 2^138242659 is an apocalyptic number.

138242659 is a deficient number, since it is larger than the sum of its proper divisors (1).

138242659 is an equidigital number, since it uses as much as digits as its factorization.

138242659 is an evil number, because the sum of its binary digits is even.

The product of its digits is 103680, while the sum is 40.

The square root of 138242659 is about 11757.6638410868. The cubic root of 138242659 is about 517.0676407726.

The spelling of 138242659 in words is "one hundred thirty-eight million, two hundred forty-two thousand, six hundred fifty-nine".