28311271 has 2 divisors, whose sum is σ = 28311272. Its totient is φ = 28311270.

The previous prime is 28311251. The next prime is 28311313. The reversal of 28311271 is 17211382.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28311271 - 2²³ = 19922663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28311211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14155635 + 14155636.

It is an arithmetic number, because the mean of its divisors is an integer number (14155636).

Almost surely, 2^28311271 is an apocalyptic number.

28311271 is a deficient number, since it is larger than the sum of its proper divisors (1).

28311271 is an equidigital number, since it uses as much as digits as its factorization.

28311271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 672, while the sum is 25.

The square root of 28311271 is about 5320.8336752806. The cubic root of 28311271 is about 304.7799936293.

It can be divided in two parts, 28311 and 271, that added together give a palindrome (28582).

The spelling of 28311271 in words is "twenty-eight million, three hundred eleven thousand, two hundred seventy-one".