138361631 has 2 divisors, whose sum is σ = 138361632. Its totient is φ = 138361630.

The previous prime is 138361621. The next prime is 138361669. The reversal of 138361631 is 136163831.

It is a weak prime.

It is an emirp because it is prime and its reverse (136163831) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 138361631 - 2⁶ = 138361567 is a prime.

It is a super-2 number, since 2×138361631² = 38287881865960322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138361621) 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, 69180815 + 69180816.

It is an arithmetic number, because the mean of its divisors is an integer number (69180816).

Almost surely, 2^138361631 is an apocalyptic number.

138361631 is a deficient number, since it is larger than the sum of its proper divisors (1).

138361631 is an equidigital number, since it uses as much as digits as its factorization.

138361631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 138361631 is about 11762.7220914208. The cubic root of 138361631 is about 517.2159281709.

The spelling of 138361631 in words is "one hundred thirty-eight million, three hundred sixty-one thousand, six hundred thirty-one".