28211093 has 2 divisors, whose sum is σ = 28211094. Its totient is φ = 28211092.

The previous prime is 28211083. The next prime is 28211101. The reversal of 28211093 is 39011282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18464209 + 9746884 = 4297^2 + 3122^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28211093 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28211033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14105546 + 14105547.

It is an arithmetic number, because the mean of its divisors is an integer number (14105547).

Almost surely, 2^28211093 is an apocalyptic number.

It is an amenable number.

28211093 is a deficient number, since it is larger than the sum of its proper divisors (1).

28211093 is an equidigital number, since it uses as much as digits as its factorization.

28211093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 28211093 is about 5311.4115826210. The cubic root of 28211093 is about 304.4200859275.

The spelling of 28211093 in words is "twenty-eight million, two hundred eleven thousand, ninety-three".