138387031 has 2 divisors, whose sum is σ = 138387032. Its totient is φ = 138387030.

The previous prime is 138387019. The next prime is 138387071. The reversal of 138387031 is 130783831.

It is a weak prime.

It is an emirp because it is prime and its reverse (130783831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138387031 - 2⁵ = 138386999 is a prime.

It is a super-2 number, since 2×138387031² = 38301940697989922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138387071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69193515 + 69193516.

It is an arithmetic number, because the mean of its divisors is an integer number (69193516).

Almost surely, 2^138387031 is an apocalyptic number.

138387031 is a deficient number, since it is larger than the sum of its proper divisors (1).

138387031 is an equidigital number, since it uses as much as digits as its factorization.

138387031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 138387031 is about 11763.8017239326. The cubic root of 138387031 is about 517.2475758675.

The spelling of 138387031 in words is "one hundred thirty-eight million, three hundred eighty-seven thousand, thirty-one".