1321323139 has 2 divisors, whose sum is σ = 1321323140. Its totient is φ = 1321323138.

The previous prime is 1321323131. The next prime is 1321323149. The reversal of 1321323139 is 9313231231.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1321323139 - 2³ = 1321323131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1321323131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660661569 + 660661570.

It is an arithmetic number, because the mean of its divisors is an integer number (660661570).

Almost surely, 2^1321323139 is an apocalyptic number.

1321323139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321323139 is an equidigital number, since it uses as much as digits as its factorization.

1321323139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 1321323139 is about 36350.0087895450. The cubic root of 1321323139 is about 1097.3277113956.

The spelling of 1321323139 in words is "one billion, three hundred twenty-one million, three hundred twenty-three thousand, one hundred thirty-nine".