138030031 has 2 divisors, whose sum is σ = 138030032. Its totient is φ = 138030030.

The previous prime is 138030029. The next prime is 138030049. The reversal of 138030031 is 130030831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138030031 - 2¹ = 138030029 is a prime.

It is a super-2 number, since 2×138030031² = 38104578915721922, which contains 22 as substring.

Together with 138030029, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138029990 and 138030008.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138030001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69015015 + 69015016.

It is an arithmetic number, because the mean of its divisors is an integer number (69015016).

Almost surely, 2^138030031 is an apocalyptic number.

138030031 is a deficient number, since it is larger than the sum of its proper divisors (1).

138030031 is an equidigital number, since it uses as much as digits as its factorization.

138030031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 138030031 is about 11748.6182591827. The cubic root of 138030031 is about 516.8024079462.

Adding to 138030031 its reverse (130030831), we get a palindrome (268060862).

The spelling of 138030031 in words is "one hundred thirty-eight million, thirty thousand, thirty-one".