139376681 has 8 divisors (see below), whose sum is σ = 141189384. Its totient is φ = 137571840.

The previous prime is 139376603. The next prime is 139376707. The reversal of 139376681 is 186673931.

It can be written as a sum of positive squares in 4 ways, for example, as 10758400 + 128618281 = 3280^2 + 11341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139376681 is a prime.

It is a super-2 number, since 2×139376681² = 38851718413151522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139676681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39131 + ... + 42543.

It is an arithmetic number, because the mean of its divisors is an integer number (17648673).

Almost surely, 2^139376681 is an apocalyptic number.

It is an amenable number.

139376681 is a deficient number, since it is larger than the sum of its proper divisors (1812703).

139376681 is an equidigital number, since it uses as much as digits as its factorization.

139376681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3931.

The product of its digits is 163296, while the sum is 44.

The square root of 139376681 is about 11805.7901472117. The cubic root of 139376681 is about 518.4776493439.

The spelling of 139376681 in words is "one hundred thirty-nine million, three hundred seventy-six thousand, six hundred eighty-one".