3556681 has 2 divisors, whose sum is σ = 3556682. Its totient is φ = 3556680.

The previous prime is 3556669. The next prime is 3556687. The reversal of 3556681 is 1866553.

3556681 is nontrivially palindromic in base 12.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3549456 + 7225 = 1884^2 + 85^2 .

It is a cyclic number.

It is not a de Polignac number, because 3556681 - 2⁵ = 3556649 is a prime.

It is a super-2 number, since 2×3556681² = 25299959471522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3556687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1778340 + 1778341.

It is an arithmetic number, because the mean of its divisors is an integer number (1778341).

Almost surely, 2^3556681 is an apocalyptic number.

It is an amenable number.

3556681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3556681 is an equidigital number, since it uses as much as digits as its factorization.

3556681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 34.

The square root of 3556681 is about 1885.9164880768. The cubic root of 3556681 is about 152.6446678785.

The spelling of 3556681 in words is "three million, five hundred fifty-six thousand, six hundred eighty-one".