28717145231 has 2 divisors, whose sum is σ = 28717145232. Its totient is φ = 28717145230.

The previous prime is 28717145227. The next prime is 28717145299. The reversal of 28717145231 is 13254171782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28717145231 - 2² = 28717145227 is a prime.

It is a super-2 number, since 2×28717145231² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28717145531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14358572615 + 14358572616.

It is an arithmetic number, because the mean of its divisors is an integer number (14358572616).

Almost surely, 2^28717145231 is an apocalyptic number.

28717145231 is a deficient number, since it is larger than the sum of its proper divisors (1).

28717145231 is an equidigital number, since it uses as much as digits as its factorization.

28717145231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 94080, while the sum is 41.

The spelling of 28717145231 in words is "twenty-eight billion, seven hundred seventeen million, one hundred forty-five thousand, two hundred thirty-one".