3556981 has 2 divisors, whose sum is σ = 3556982. Its totient is φ = 3556980.

The previous prime is 3556979. The next prime is 3556991. The reversal of 3556981 is 1896553.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2056356 + 1500625 = 1434^2 + 1225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3556981 - 2¹ = 3556979 is a prime.

It is a super-2 number, since 2×3556981² = 25304227668722, which contains 22 as substring.

Together with 3556979, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3556981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3556951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1778490 + 1778491.

It is an arithmetic number, because the mean of its divisors is an integer number (1778491).

Almost surely, 2^3556981 is an apocalyptic number.

It is an amenable number.

3556981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3556981 is an equidigital number, since it uses as much as digits as its factorization.

3556981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 3556981 is about 1885.9960233256. The cubic root of 3556981 is about 152.6489595306.

The spelling of 3556981 in words is "three million, five hundred fifty-six thousand, nine hundred eighty-one".