138151631 has 2 divisors, whose sum is σ = 138151632. Its totient is φ = 138151630.

The previous prime is 138151613. The next prime is 138151649. The reversal of 138151631 is 136151831.

Together with previous prime (138151613) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (138151613) and next prime (138151649).

It is an emirp because it is prime and its reverse (136151831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138151631 - 2⁶ = 138151567 is a prime.

It is a super-2 number, since 2×138151631² = 38171746295920322, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 138151594 and 138151603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138151661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69075815 + 69075816.

It is an arithmetic number, because the mean of its divisors is an integer number (69075816).

Almost surely, 2^138151631 is an apocalyptic number.

138151631 is a deficient number, since it is larger than the sum of its proper divisors (1).

138151631 is an equidigital number, since it uses as much as digits as its factorization.

138151631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 29.

The square root of 138151631 is about 11753.7921965636. The cubic root of 138151631 is about 516.9541254797.

The spelling of 138151631 in words is "one hundred thirty-eight million, one hundred fifty-one thousand, six hundred thirty-one".