1291604273 has 2 divisors, whose sum is σ = 1291604274. Its totient is φ = 1291604272.

The previous prime is 1291604267. The next prime is 1291604357. The reversal of 1291604273 is 3724061921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028613184 + 262991089 = 32072^2 + 16217^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291604273 - 2¹⁴ = 1291587889 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291604213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645802136 + 645802137.

It is an arithmetic number, because the mean of its divisors is an integer number (645802137).

Almost surely, 2^1291604273 is an apocalyptic number.

It is an amenable number.

1291604273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291604273 is an equidigital number, since it uses as much as digits as its factorization.

1291604273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 1291604273 is about 35938.8963798278. The cubic root of 1291604273 is about 1089.0383103667.

The spelling of 1291604273 in words is "one billion, two hundred ninety-one million, six hundred four thousand, two hundred seventy-three".