28101001 has 2 divisors, whose sum is σ = 28101002. Its totient is φ = 28101000.

The previous prime is 28100977. The next prime is 28101013. The reversal of 28101001 is 10010182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28100601 + 400 = 5301^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 28101001 - 2¹¹ = 28098953 is a prime.

It is not a weakly prime, because it can be changed into another prime (28101041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14050500 + 14050501.

It is an arithmetic number, because the mean of its divisors is an integer number (14050501).

Almost surely, 2^28101001 is an apocalyptic number.

It is an amenable number.

28101001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28101001 is an equidigital number, since it uses as much as digits as its factorization.

28101001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 28101001 is about 5301.0377285962. The cubic root of 28101001 is about 304.0235763398.

Adding to 28101001 its reverse (10010182), we get a palindrome (38111183).

The spelling of 28101001 in words is "twenty-eight million, one hundred one thousand, one".