28931017 has 2 divisors, whose sum is σ = 28931018. Its totient is φ = 28931016.

The previous prime is 28930973. The next prime is 28931027. The reversal of 28931017 is 71013982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20757136 + 8173881 = 4556^2 + 2859^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28931017 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28931017.

It is not a weakly prime, because it can be changed into another prime (28931027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465508 + 14465509.

It is an arithmetic number, because the mean of its divisors is an integer number (14465509).

Almost surely, 2^28931017 is an apocalyptic number.

It is an amenable number.

28931017 is a deficient number, since it is larger than the sum of its proper divisors (1).

28931017 is an equidigital number, since it uses as much as digits as its factorization.

28931017 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 28931017 is about 5378.7560829619. The cubic root of 28931017 is about 306.9878826823.

Adding to 28931017 its reverse (71013982), we get a palindrome (99944999).

The spelling of 28931017 in words is "twenty-eight million, nine hundred thirty-one thousand, seventeen".