139361629681 has 4 divisors (see below), whose sum is σ = 139364176500. Its totient is φ = 139359082864.

The previous prime is 139361629663. The next prime is 139361629697. The reversal of 139361629681 is 186926163931.

139361629681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22435246656 + 116926383025 = 149784^2 + 341945^2 .

It is a cyclic number.

It is not a de Polignac number, because 139361629681 - 2¹⁷ = 139361498609 is a prime.

It is a super-2 number, since 2×139361629681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139361629651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189486 + ... + 1301383.

It is an arithmetic number, because the mean of its divisors is an integer number (34841044125).

Almost surely, 2^139361629681 is an apocalyptic number.

It is an amenable number.

139361629681 is a deficient number, since it is larger than the sum of its proper divisors (2546819).

139361629681 is an equidigital number, since it uses as much as digits as its factorization.

139361629681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546818.

The product of its digits is 2519424, while the sum is 55.

The spelling of 139361629681 in words is "one hundred thirty-nine billion, three hundred sixty-one million, six hundred twenty-nine thousand, six hundred eighty-one".