28561271 has 2 divisors, whose sum is σ = 28561272. Its totient is φ = 28561270.

The previous prime is 28561249. The next prime is 28561277. The reversal of 28561271 is 17216582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28561271 - 2¹⁸ = 28299127 is a prime.

It is a super-2 number, since 2×28561271² = 1631492402270882, which contains 22 as substring.

It is a Chen prime.

It is equal to p_1774184 and since 28561271 and 1774184 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28561277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14280635 + 14280636.

It is an arithmetic number, because the mean of its divisors is an integer number (14280636).

Almost surely, 2^28561271 is an apocalyptic number.

28561271 is a deficient number, since it is larger than the sum of its proper divisors (1).

28561271 is an equidigital number, since it uses as much as digits as its factorization.

28561271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 32.

The square root of 28561271 is about 5344.2745999808. The cubic root of 28561271 is about 305.6744761913.

The spelling of 28561271 in words is "twenty-eight million, five hundred sixty-one thousand, two hundred seventy-one".