1321839149 has 2 divisors, whose sum is σ = 1321839150. Its totient is φ = 1321839148.

The previous prime is 1321839109. The next prime is 1321839179. The reversal of 1321839149 is 9419381231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1211736100 + 110103049 = 34810^2 + 10493^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321839149 - 2²⁰ = 1320790573 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321839109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660919574 + 660919575.

It is an arithmetic number, because the mean of its divisors is an integer number (660919575).

Almost surely, 2^1321839149 is an apocalyptic number.

It is an amenable number.

1321839149 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321839149 is an equidigital number, since it uses as much as digits as its factorization.

1321839149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 41.

The square root of 1321839149 is about 36357.1058941715. The cubic root of 1321839149 is about 1097.4705375175.

The spelling of 1321839149 in words is "one billion, three hundred twenty-one million, eight hundred thirty-nine thousand, one hundred forty-nine".