823870321 has 2 divisors, whose sum is σ = 823870322. Its totient is φ = 823870320.

The previous prime is 823870301. The next prime is 823870339. The reversal of 823870321 is 123078328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 621804096 + 202066225 = 24936^2 + 14215^2 .

It is a cyclic number.

It is not a de Polignac number, because 823870321 - 2¹¹ = 823868273 is a prime.

It is not a weakly prime, because it can be changed into another prime (823870301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411935160 + 411935161.

It is an arithmetic number, because the mean of its divisors is an integer number (411935161).

Almost surely, 2^823870321 is an apocalyptic number.

It is an amenable number.

823870321 is a deficient number, since it is larger than the sum of its proper divisors (1).

823870321 is an equidigital number, since it uses as much as digits as its factorization.

823870321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 823870321 is about 28703.1413089230. The cubic root of 823870321 is about 937.4604459994.

The spelling of 823870321 in words is "eight hundred twenty-three million, eight hundred seventy thousand, three hundred twenty-one".