28133197481 has 2 divisors, whose sum is σ = 28133197482. Its totient is φ = 28133197480.

The previous prime is 28133197471. The next prime is 28133197517. The reversal of 28133197481 is 18479133182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16347923881 + 11785273600 = 127859^2 + 108560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28133197481 is a prime.

It is a super-2 number, since 2×28133197481² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28133197471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066598740 + 14066598741.

It is an arithmetic number, because the mean of its divisors is an integer number (14066598741).

Almost surely, 2^28133197481 is an apocalyptic number.

It is an amenable number.

28133197481 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133197481 is an equidigital number, since it uses as much as digits as its factorization.

28133197481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The spelling of 28133197481 in words is "twenty-eight billion, one hundred thirty-three million, one hundred ninety-seven thousand, four hundred eighty-one".