139337681 has 8 divisors (see below), whose sum is σ = 160820544. Its totient is φ = 118249200.

The previous prime is 139337677. The next prime is 139337683. The reversal of 139337681 is 186733931.

139337681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 139337681 - 2² = 139337677 is a prime.

It is a super-2 number, since 2×139337681² = 38829978692915522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (139337683) 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, 97835 + ... + 99248.

It is an arithmetic number, because the mean of its divisors is an integer number (20102568).

Almost surely, 2^139337681 is an apocalyptic number.

It is an amenable number.

139337681 is a deficient number, since it is larger than the sum of its proper divisors (21482863).

139337681 is a wasteful number, since it uses less digits than its factorization.

139337681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197191.

The product of its digits is 81648, while the sum is 41.

The square root of 139337681 is about 11804.1382997659. The cubic root of 139337681 is about 518.4292851687.

The spelling of 139337681 in words is "one hundred thirty-nine million, three hundred thirty-seven thousand, six hundred eighty-one".