1020063581 has 2 divisors, whose sum is σ = 1020063582. Its totient is φ = 1020063580.

The previous prime is 1020063571. The next prime is 1020063613. The reversal of 1020063581 is 1853600201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 737991556 + 282072025 = 27166^2 + 16795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020063581 - 2²² = 1015869277 is a prime.

It is a super-2 number, since 2×1020063581² = 2081059418565087122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1020063581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020063511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510031790 + 510031791.

It is an arithmetic number, because the mean of its divisors is an integer number (510031791).

Almost surely, 2^1020063581 is an apocalyptic number.

It is an amenable number.

1020063581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020063581 is an equidigital number, since it uses as much as digits as its factorization.

1020063581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 1020063581 is about 31938.4342289975. The cubic root of 1020063581 is about 1006.6436248375.

Adding to 1020063581 its reverse (1853600201), we get a palindrome (2873663782).

The spelling of 1020063581 in words is "one billion, twenty million, sixty-three thousand, five hundred eighty-one".