1291746473 has 2 divisors, whose sum is σ = 1291746474. Its totient is φ = 1291746472.

The previous prime is 1291746419. The next prime is 1291746481. The reversal of 1291746473 is 3746471921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 742453504 + 549292969 = 27248^2 + 23437^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291746473 - 2¹⁰ = 1291745449 is a prime.

It is not a weakly prime, because it can be changed into another prime (1291746403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645873236 + 645873237.

It is an arithmetic number, because the mean of its divisors is an integer number (645873237).

Almost surely, 2^1291746473 is an apocalyptic number.

It is an amenable number.

1291746473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291746473 is an equidigital number, since it uses as much as digits as its factorization.

1291746473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 44.

The square root of 1291746473 is about 35940.8746832906. The cubic root of 1291746473 is about 1089.0782750236.

The spelling of 1291746473 in words is "one billion, two hundred ninety-one million, seven hundred forty-six thousand, four hundred seventy-three".