1291193117 has 2 divisors, whose sum is σ = 1291193118. Its totient is φ = 1291193116.

The previous prime is 1291193087. The next prime is 1291193131. The reversal of 1291193117 is 7113911921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1170939961 + 120253156 = 34219^2 + 10966^2 .

It is an emirp because it is prime and its reverse (7113911921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1291193117 - 2¹⁶ = 1291127581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291193177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645596558 + 645596559.

It is an arithmetic number, because the mean of its divisors is an integer number (645596559).

Almost surely, 2^1291193117 is an apocalyptic number.

It is an amenable number.

1291193117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291193117 is an equidigital number, since it uses as much as digits as its factorization.

1291193117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3402, while the sum is 35.

The square root of 1291193117 is about 35933.1757154861. The cubic root of 1291193117 is about 1088.9227403567.

The spelling of 1291193117 in words is "one billion, two hundred ninety-one million, one hundred ninety-three thousand, one hundred seventeen".