3911681 has 2 divisors, whose sum is σ = 3911682. Its totient is φ = 3911680.

The previous prime is 3911653. The next prime is 3911689. The reversal of 3911681 is 1861193.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2371600 + 1540081 = 1540^2 + 1241^2 .

It is a cyclic number.

It is not a de Polignac number, because 3911681 - 2⁶ = 3911617 is a prime.

It is a super-2 number, since 2×3911681² = 30602496491522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3911689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1955840 + 1955841.

It is an arithmetic number, because the mean of its divisors is an integer number (1955841).

It is a Proth number, since it is equal to 955 ⋅ 2¹² + 1 and 955 < 2¹².

Almost surely, 2^3911681 is an apocalyptic number.

It is an amenable number.

3911681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3911681 is an equidigital number, since it uses as much as digits as its factorization.

3911681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 3911681 is about 1977.7970067729. The cubic root of 3911681 is about 157.5630855034.

The spelling of 3911681 in words is "three million, nine hundred eleven thousand, six hundred eighty-one".