138298231 has 2 divisors, whose sum is σ = 138298232. Its totient is φ = 138298230.

The previous prime is 138298229. The next prime is 138298291. The reversal of 138298231 is 132892831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138298231 - 2¹ = 138298229 is a prime.

It is a super-2 number, since 2×138298231² = 38252801395458722, which contains 22 as substring.

Together with 138298229, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138298201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69149115 + 69149116.

It is an arithmetic number, because the mean of its divisors is an integer number (69149116).

Almost surely, 2^138298231 is an apocalyptic number.

138298231 is a deficient number, since it is larger than the sum of its proper divisors (1).

138298231 is an equidigital number, since it uses as much as digits as its factorization.

138298231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 138298231 is about 11760.0268282007. The cubic root of 138298231 is about 517.1369166235.

The spelling of 138298231 in words is "one hundred thirty-eight million, two hundred ninety-eight thousand, two hundred thirty-one".