1323121249 has 2 divisors, whose sum is σ = 1323121250. Its totient is φ = 1323121248.

The previous prime is 1323121231. The next prime is 1323121273. The reversal of 1323121249 is 9421213231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 852231249 + 470890000 = 29193^2 + 21700^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323121249 - 2¹¹ = 1323119201 is a prime.

It is not a weakly prime, because it can be changed into another prime (1323121229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661560624 + 661560625.

It is an arithmetic number, because the mean of its divisors is an integer number (661560625).

Almost surely, 2^1323121249 is an apocalyptic number.

It is an amenable number.

1323121249 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323121249 is an equidigital number, since it uses as much as digits as its factorization.

1323121249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 1323121249 is about 36374.7336622552. The cubic root of 1323121249 is about 1097.8252484267.

The spelling of 1323121249 in words is "one billion, three hundred twenty-three million, one hundred twenty-one thousand, two hundred forty-nine".