3031681 has 2 divisors, whose sum is σ = 3031682. Its totient is φ = 3031680.

The previous prime is 3031667. The next prime is 3031687. The reversal of 3031681 is 1861303.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2944656 + 87025 = 1716^2 + 295^2 .

It is an emirp because it is prime and its reverse (1861303) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3031681 - 2⁹ = 3031169 is a prime.

It is a super-2 number, since 2×3031681² = 18382179371522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3031687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1515840 + 1515841.

It is an arithmetic number, because the mean of its divisors is an integer number (1515841).

Almost surely, 2^3031681 is an apocalyptic number.

It is an amenable number.

3031681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3031681 is an equidigital number, since it uses as much as digits as its factorization.

3031681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 3031681 is about 1741.1723062351. The cubic root of 3031681 is about 144.7308681983.

Adding to 3031681 its reverse (1861303), we get a palindrome (4892984).

The spelling of 3031681 in words is "three million, thirty-one thousand, six hundred eighty-one".