28171553 has 2 divisors, whose sum is σ = 28171554. Its totient is φ = 28171552.

The previous prime is 28171543. The next prime is 28171589. The reversal of 28171553 is 35517182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25684624 + 2486929 = 5068^2 + 1577^2 .

It is a cyclic number.

It is not a de Polignac number, because 28171553 - 2⁴ = 28171537 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (28171513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14085776 + 14085777.

It is an arithmetic number, because the mean of its divisors is an integer number (14085777).

Almost surely, 2^28171553 is an apocalyptic number.

It is an amenable number.

28171553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171553 is an equidigital number, since it uses as much as digits as its factorization.

28171553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 32.

The square root of 28171553 is about 5307.6881031199. The cubic root of 28171553 is about 304.2777967688.

The spelling of 28171553 in words is "twenty-eight million, one hundred seventy-one thousand, five hundred fifty-three".