28321061 has 2 divisors, whose sum is σ = 28321062. Its totient is φ = 28321060.

The previous prime is 28320979. The next prime is 28321063. The reversal of 28321061 is 16012382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 10764961 = 4190^2 + 3281^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28321061 is a prime.

Together with 28321063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28321063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14160530 + 14160531.

It is an arithmetic number, because the mean of its divisors is an integer number (14160531).

Almost surely, 2^28321061 is an apocalyptic number.

It is an amenable number.

28321061 is a deficient number, since it is larger than the sum of its proper divisors (1).

28321061 is an equidigital number, since it uses as much as digits as its factorization.

28321061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 28321061 is about 5321.7535643808. The cubic root of 28321061 is about 304.8151204200.

The spelling of 28321061 in words is "twenty-eight million, three hundred twenty-one thousand, sixty-one".