28531029797 has 2 divisors, whose sum is σ = 28531029798. Its totient is φ = 28531029796.

The previous prime is 28531029763. The next prime is 28531029809. The reversal of 28531029797 is 79792013582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20598277441 + 7932752356 = 143521^2 + 89066^2 .

It is a cyclic number.

It is not a de Polignac number, because 28531029797 - 2³⁰ = 27457287973 is a prime.

It is a super-3 number, since 3×28531029797³ (a number of 32 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 (28531029727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14265514898 + 14265514899.

It is an arithmetic number, because the mean of its divisors is an integer number (14265514899).

Almost surely, 2^28531029797 is an apocalyptic number.

It is an amenable number.

28531029797 is a deficient number, since it is larger than the sum of its proper divisors (1).

28531029797 is an equidigital number, since it uses as much as digits as its factorization.

28531029797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1905120, while the sum is 53.

The spelling of 28531029797 in words is "twenty-eight billion, five hundred thirty-one million, twenty-nine thousand, seven hundred ninety-seven".