3538607981 has 2 divisors, whose sum is σ = 3538607982. Its totient is φ = 3538607980.

The previous prime is 3538607977. The next prime is 3538607999. The reversal of 3538607981 is 1897068353.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3294186025 + 244421956 = 57395^2 + 15634^2 .

It is a cyclic number.

It is not a de Polignac number, because 3538607981 - 2² = 3538607977 is a prime.

It is a super-2 number, since 2×3538607981² = 25043492886393792722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3538607921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1769303990 + 1769303991.

It is an arithmetic number, because the mean of its divisors is an integer number (1769303991).

Almost surely, 2^3538607981 is an apocalyptic number.

It is an amenable number.

3538607981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3538607981 is an equidigital number, since it uses as much as digits as its factorization.

3538607981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The square root of 3538607981 is about 59486.1999206539. The cubic root of 3538607981 is about 1523.8567773051.

The spelling of 3538607981 in words is "three billion, five hundred thirty-eight million, six hundred seven thousand, nine hundred eighty-one".