1291079693 has 2 divisors, whose sum is σ = 1291079694. Its totient is φ = 1291079692.

The previous prime is 1291079663. The next prime is 1291079711. The reversal of 1291079693 is 3969701921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1070794729 + 220284964 = 32723^2 + 14842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1291079693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291079633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645539846 + 645539847.

It is an arithmetic number, because the mean of its divisors is an integer number (645539847).

Almost surely, 2^1291079693 is an apocalyptic number.

It is an amenable number.

1291079693 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291079693 is an equidigital number, since it uses as much as digits as its factorization.

1291079693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 1291079693 is about 35931.5974178716. The cubic root of 1291079693 is about 1088.8908541918.

The spelling of 1291079693 in words is "one billion, two hundred ninety-one million, seventy-nine thousand, six hundred ninety-three".