3539969581 has 2 divisors, whose sum is σ = 3539969582. Its totient is φ = 3539969580.

The previous prime is 3539969549. The next prime is 3539969597. The reversal of 3539969581 is 1859699353.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3362840100 + 177129481 = 57990^2 + 13309^2 .

It is a cyclic number.

It is not a de Polignac number, because 3539969581 - 2⁵ = 3539969549 is a prime.

It is a super-2 number, since 2×3539969581² = 25062769268810631122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3539969501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769984790 + 1769984791.

It is an arithmetic number, because the mean of its divisors is an integer number (1769984791).

Almost surely, 2^3539969581 is an apocalyptic number.

It is an amenable number.

3539969581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3539969581 is an equidigital number, since it uses as much as digits as its factorization.

3539969581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7873200, while the sum is 58.

The square root of 3539969581 is about 59497.6434911501. The cubic root of 3539969581 is about 1524.0522041819.

The spelling of 3539969581 in words is "three billion, five hundred thirty-nine million, nine hundred sixty-nine thousand, five hundred eighty-one".