28311313 has 2 divisors, whose sum is σ = 28311314. Its totient is φ = 28311312.

The previous prime is 28311271. The next prime is 28311323. The reversal of 28311313 is 31311382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22391824 + 5919489 = 4732^2 + 2433^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311313 - 2²¹ = 26214161 is a prime.

It is not a weakly prime, because it can be changed into another prime (28311323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155656 + 14155657.

It is an arithmetic number, because the mean of its divisors is an integer number (14155657).

Almost surely, 2^28311313 is an apocalyptic number.

It is an amenable number.

28311313 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311313 is an equidigital number, since it uses as much as digits as its factorization.

28311313 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 28311313 is about 5320.8376220291. The cubic root of 28311313 is about 304.7801443437.

Adding to 28311313 its reverse (31311382), we get a palindrome (59622695).

The spelling of 28311313 in words is "twenty-eight million, three hundred eleven thousand, three hundred thirteen".