28251101 has 2 divisors, whose sum is σ = 28251102. Its totient is φ = 28251100.

The previous prime is 28251079. The next prime is 28251109. The reversal of 28251101 is 10115282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21996100 + 6255001 = 4690^2 + 2501^2 .

It is a cyclic number.

It is not a de Polignac number, because 28251101 - 2⁶ = 28251037 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 (28251109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14125550 + 14125551.

It is an arithmetic number, because the mean of its divisors is an integer number (14125551).

Almost surely, 2^28251101 is an apocalyptic number.

It is an amenable number.

28251101 is a deficient number, since it is larger than the sum of its proper divisors (1).

28251101 is an equidigital number, since it uses as much as digits as its factorization.

28251101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 28251101 is about 5315.1764787258. The cubic root of 28251101 is about 304.5639239789.

Adding to 28251101 its reverse (10115282), we get a palindrome (38366383).

The spelling of 28251101 in words is "twenty-eight million, two hundred fifty-one thousand, one hundred one".