6139681 has 2 divisors, whose sum is σ = 6139682. Its totient is φ = 6139680.

The previous prime is 6139673. The next prime is 6139687. The reversal of 6139681 is 1869316.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5803281 + 336400 = 2409^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 6139681 - 2³ = 6139673 is a prime.

It is a super-2 number, since 2×6139681² = 75391365563522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6139687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3069840 + 3069841.

It is an arithmetic number, because the mean of its divisors is an integer number (3069841).

Almost surely, 2^6139681 is an apocalyptic number.

It is an amenable number.

6139681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6139681 is an equidigital number, since it uses as much as digits as its factorization.

6139681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 34.

The square root of 6139681 is about 2477.8379688753. The cubic root of 6139681 is about 183.1113519010. Note that the first 3 decimals are identical.

The spelling of 6139681 in words is "six million, one hundred thirty-nine thousand, six hundred eighty-one".