1323121001 has 2 divisors, whose sum is σ = 1323121002. Its totient is φ = 1323121000.

The previous prime is 1323120989. The next prime is 1323121003. The reversal of 1323121001 is 1001213231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1019141776 + 303979225 = 31924^2 + 17435^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323121001 - 2¹⁸ = 1322858857 is a prime.

It is a Sophie Germain prime.

Together with 1323121003, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1323121003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661560500 + 661560501.

It is an arithmetic number, because the mean of its divisors is an integer number (661560501).

Almost surely, 2^1323121001 is an apocalyptic number.

It is an amenable number.

1323121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323121001 is an equidigital number, since it uses as much as digits as its factorization.

1323121001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1323121001 is about 36374.7302532954. The cubic root of 1323121001 is about 1097.8251798362.

Adding to 1323121001 its reverse (1001213231), we get a palindrome (2324334232).

The spelling of 1323121001 in words is "one billion, three hundred twenty-three million, one hundred twenty-one thousand, one".