3581431505881 has 2 divisors, whose sum is σ = 3581431505882. Its totient is φ = 3581431505880.

The previous prime is 3581431505819. The next prime is 3581431505929. The reversal of 3581431505881 is 1885051341853.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2640677000256 + 940754505625 = 1625016^2 + 969925^2 .

It is an emirp because it is prime and its reverse (1885051341853) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3581431505881 - 2⁷ = 3581431505753 is a prime.

It is a super-2 number, since 2×3581431505881² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3581431502881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1790715752940 + 1790715752941.

It is an arithmetic number, because the mean of its divisors is an integer number (1790715752941).

Almost surely, 2^{3581431505881} is an apocalyptic number.

It is an amenable number.

3581431505881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3581431505881 is an equidigital number, since it uses as much as digits as its factorization.

3581431505881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304000, while the sum is 52.

The spelling of 3581431505881 in words is "three trillion, five hundred eighty-one billion, four hundred thirty-one million, five hundred five thousand, eight hundred eighty-one".