28331248117 has 2 divisors, whose sum is σ = 28331248118. Its totient is φ = 28331248116.

The previous prime is 28331248067. The next prime is 28331248123. The reversal of 28331248117 is 71184213382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27701940721 + 629307396 = 166439^2 + 25086^2 .

It is a cyclic number.

It is not a de Polignac number, because 28331248117 - 2¹⁹ = 28330723829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28331248117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28331248157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14165624058 + 14165624059.

It is an arithmetic number, because the mean of its divisors is an integer number (14165624059).

Almost surely, 2^28331248117 is an apocalyptic number.

It is an amenable number.

28331248117 is a deficient number, since it is larger than the sum of its proper divisors (1).

28331248117 is an equidigital number, since it uses as much as digits as its factorization.

28331248117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The spelling of 28331248117 in words is "twenty-eight billion, three hundred thirty-one million, two hundred forty-eight thousand, one hundred seventeen".