138467831 has 2 divisors, whose sum is σ = 138467832. Its totient is φ = 138467830.

The previous prime is 138467789. The next prime is 138467893. The reversal of 138467831 is 138764831.

138467831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (138764831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138467831 - 2⁶ = 138467767 is a prime.

It is a super-2 number, since 2×138467831² = 38346680443689122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138457831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69233915 + 69233916.

It is an arithmetic number, because the mean of its divisors is an integer number (69233916).

Almost surely, 2^138467831 is an apocalyptic number.

138467831 is a deficient number, since it is larger than the sum of its proper divisors (1).

138467831 is an equidigital number, since it uses as much as digits as its factorization.

138467831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 138467831 is about 11767.2354867233. The cubic root of 138467831 is about 517.3482246842.

The spelling of 138467831 in words is "one hundred thirty-eight million, four hundred sixty-seven thousand, eight hundred thirty-one".