1020143303581 has 2 divisors, whose sum is σ = 1020143303582. Its totient is φ = 1020143303580.

The previous prime is 1020143303563. The next prime is 1020143303639. The reversal of 1020143303581 is 1853033410201.

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., 1016687039481 + 3456264100 = 1008309^2 + 58790^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020143303581 - 2¹³ = 1020143295389 is a prime.

It is a super-2 number, since 2×1020143303581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020143303681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510071651790 + 510071651791.

It is an arithmetic number, because the mean of its divisors is an integer number (510071651791).

Almost surely, 2^{1020143303581} is an apocalyptic number.

It is an amenable number.

1020143303581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020143303581 is an equidigital number, since it uses as much as digits as its factorization.

1020143303581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 1020143303581 its reverse (1853033410201), we get a palindrome (2873176713782).

The spelling of 1020143303581 in words is "one trillion, twenty billion, one hundred forty-three million, three hundred three thousand, five hundred eighty-one".