1309733273 has 2 divisors, whose sum is σ = 1309733274. Its totient is φ = 1309733272.

The previous prime is 1309733231. The next prime is 1309733303. The reversal of 1309733273 is 3723379031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730512784 + 579220489 = 27028^2 + 24067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309733273 - 2¹² = 1309729177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1309733203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654866636 + 654866637.

It is an arithmetic number, because the mean of its divisors is an integer number (654866637).

Almost surely, 2^1309733273 is an apocalyptic number.

It is an amenable number.

1309733273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309733273 is an equidigital number, since it uses as much as digits as its factorization.

1309733273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 38.

The square root of 1309733273 is about 36190.2372608968. The cubic root of 1309733273 is about 1094.1099146271.

The spelling of 1309733273 in words is "one billion, three hundred nine million, seven hundred thirty-three thousand, two hundred seventy-three".