1323139889 has 2 divisors, whose sum is σ = 1323139890. Its totient is φ = 1323139888.

The previous prime is 1323139843. The next prime is 1323139891. The reversal of 1323139889 is 9889313231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1277347600 + 45792289 = 35740^2 + 6767^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323139889 - 2⁸ = 1323139633 is a prime.

Together with 1323139891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1323139589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 661569944 + 661569945.

It is an arithmetic number, because the mean of its divisors is an integer number (661569945).

Almost surely, 2^1323139889 is an apocalyptic number.

It is an amenable number.

1323139889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1323139889 is an equidigital number, since it uses as much as digits as its factorization.

1323139889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 47.

The square root of 1323139889 is about 36374.9898831601. The cubic root of 1323139889 is about 1097.8304037533.

The spelling of 1323139889 in words is "one billion, three hundred twenty-three million, one hundred thirty-nine thousand, eight hundred eighty-nine".