20231475533981 has 2 divisors, whose sum is σ = 20231475533982. Its totient is φ = 20231475533980.

The previous prime is 20231475533911. The next prime is 20231475533993. The reversal of 20231475533981 is 18933557413202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19895926435225 + 335549098756 = 4460485^2 + 579266^2 .

It is a cyclic number.

It is not a de Polignac number, because 20231475533981 - 2¹⁸ = 20231475271837 is a prime.

It is a super-3 number, since 3×20231475533981³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20231475533911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10115737766990 + 10115737766991.

It is an arithmetic number, because the mean of its divisors is an integer number (10115737766991).

Almost surely, 2^{20231475533981} is an apocalyptic number.

It is an amenable number.

20231475533981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20231475533981 is an equidigital number, since it uses as much as digits as its factorization.

20231475533981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5443200, while the sum is 53.

The spelling of 20231475533981 in words is "twenty trillion, two hundred thirty-one billion, four hundred seventy-five million, five hundred thirty-three thousand, nine hundred eighty-one".