823870261 has 2 divisors, whose sum is σ = 823870262. Its totient is φ = 823870260.

The previous prime is 823870259. The next prime is 823870273. The reversal of 823870261 is 162078328.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663062500 + 160807761 = 25750^2 + 12681^2 .

It is a cyclic number.

It is not a de Polignac number, because 823870261 - 2¹ = 823870259 is a prime.

Together with 823870259, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 823870261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823870561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411935130 + 411935131.

It is an arithmetic number, because the mean of its divisors is an integer number (411935131).

Almost surely, 2^823870261 is an apocalyptic number.

It is an amenable number.

823870261 is a deficient number, since it is larger than the sum of its proper divisors (1).

823870261 is an equidigital number, since it uses as much as digits as its factorization.

823870261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 823870261 is about 28703.1402637412. The cubic root of 823870261 is about 937.4604232419.

The spelling of 823870261 in words is "eight hundred twenty-three million, eight hundred seventy thousand, two hundred sixty-one".