3127681 has 2 divisors, whose sum is σ = 3127682. Its totient is φ = 3127680.

The previous prime is 3127673. The next prime is 3127687. The reversal of 3127681 is 1867213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1587600 + 1540081 = 1260^2 + 1241^2 .

It is an emirp because it is prime and its reverse (1867213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3127681 - 2³ = 3127673 is a prime.

It is a super-2 number, since 2×3127681² = 19564776875522, which contains 22 as substring.

3127681 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (3127687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1563840 + 1563841.

It is an arithmetic number, because the mean of its divisors is an integer number (1563841).

Almost surely, 2^3127681 is an apocalyptic number.

It is an amenable number.

3127681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3127681 is an equidigital number, since it uses as much as digits as its factorization.

3127681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 3127681 is about 1768.5250917078. The cubic root of 3127681 is about 146.2426845149.

The spelling of 3127681 in words is "three million, one hundred twenty-seven thousand, six hundred eighty-one".