28313911 has 2 divisors, whose sum is σ = 28313912. Its totient is φ = 28313910.

The previous prime is 28313893. The next prime is 28313921. The reversal of 28313911 is 11931382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28313911 - 2¹¹ = 28311863 is a prime.

It is a super-2 number, since 2×28313911² = 1603355112231842, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28313911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28313921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14156955 + 14156956.

It is an arithmetic number, because the mean of its divisors is an integer number (14156956).

Almost surely, 2^28313911 is an apocalyptic number.

28313911 is a deficient number, since it is larger than the sum of its proper divisors (1).

28313911 is an equidigital number, since it uses as much as digits as its factorization.

28313911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 28.

The square root of 28313911 is about 5321.0817509225. The cubic root of 28313911 is about 304.7894668196.

The spelling of 28313911 in words is "twenty-eight million, three hundred thirteen thousand, nine hundred eleven".