28121351 has 2 divisors, whose sum is σ = 28121352. Its totient is φ = 28121350.

The previous prime is 28121321. The next prime is 28121389. The reversal of 28121351 is 15312182.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28121351 - 2¹⁰ = 28120327 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28121321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14060675 + 14060676.

It is an arithmetic number, because the mean of its divisors is an integer number (14060676).

Almost surely, 2^28121351 is an apocalyptic number.

28121351 is a deficient number, since it is larger than the sum of its proper divisors (1).

28121351 is an equidigital number, since it uses as much as digits as its factorization.

28121351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 23.

The square root of 28121351 is about 5302.9568167203. The cubic root of 28121351 is about 304.0969472365.

The spelling of 28121351 in words is "twenty-eight million, one hundred twenty-one thousand, three hundred fifty-one".