138931360947 has 10 divisors (see below), whose sum is σ = 207539440548. Its totient is φ = 92620907244.

The previous prime is 138931360943. The next prime is 138931360951. The reversal of 138931360947 is 749063139831.

It is a happy number.

138931360947 is a `hidden beast` number, since 13 + 8 + 9 + 3 + 13 + 609 + 4 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (138931360943) and next prime (138931360951).

It is not a de Polignac number, because 138931360947 - 2² = 138931360943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 138931360893 and 138931360902.

It is not an unprimeable number, because it can be changed into a prime (138931360943) 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 in 9 ways as a sum of consecutive naturals, for example, 857600913 + ... + 857601074.

Almost surely, 2^138931360947 is an apocalyptic number.

138931360947 is a deficient number, since it is larger than the sum of its proper divisors (68608079601).

138931360947 is an equidigital number, since it uses as much as digits as its factorization.

138931360947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715201999 (or 1715201990 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 138931360947 in words is "one hundred thirty-eight billion, nine hundred thirty-one million, three hundred sixty thousand, nine hundred forty-seven".