823023121 has 2 divisors, whose sum is σ = 823023122. Its totient is φ = 823023120.

The previous prime is 823023101. The next prime is 823023127. The reversal of 823023121 is 121320328.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 815673600 + 7349521 = 28560^2 + 2711^2 .

It is a cyclic number.

It is not a de Polignac number, because 823023121 - 2²¹ = 820925969 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 823023092 and 823023101.

It is not a weakly prime, because it can be changed into another prime (823023127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411511560 + 411511561.

It is an arithmetic number, because the mean of its divisors is an integer number (411511561).

Almost surely, 2^823023121 is an apocalyptic number.

It is an amenable number.

823023121 is a deficient number, since it is larger than the sum of its proper divisors (1).

823023121 is an equidigital number, since it uses as much as digits as its factorization.

823023121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 823023121 is about 28688.3795464296. The cubic root of 823023121 is about 937.1390002327.

Adding to 823023121 its reverse (121320328), we get a palindrome (944343449).

It can be divided in two parts, 82 and 3023121, that added together give a palindrome (3023203).

The spelling of 823023121 in words is "eight hundred twenty-three million, twenty-three thousand, one hundred twenty-one".