823871281 has 2 divisors, whose sum is σ = 823871282. Its totient is φ = 823871280.

The previous prime is 823871249. The next prime is 823871299. The reversal of 823871281 is 182178328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812250000 + 11621281 = 28500^2 + 3409^2 .

It is a cyclic number.

It is not a de Polignac number, because 823871281 - 2⁵ = 823871249 is a prime.

It is a super-3 number, since 3×823871281³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (823871231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411935640 + 411935641.

It is an arithmetic number, because the mean of its divisors is an integer number (411935641).

Almost surely, 2^823871281 is an apocalyptic number.

It is an amenable number.

823871281 is a deficient number, since it is larger than the sum of its proper divisors (1).

823871281 is an equidigital number, since it uses as much as digits as its factorization.

823871281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43008, while the sum is 40.

The square root of 823871281 is about 28703.1580318264. The cubic root of 823871281 is about 937.4608101188.

The spelling of 823871281 in words is "eight hundred twenty-three million, eight hundred seventy-one thousand, two hundred eighty-one".