1291625597 has 2 divisors, whose sum is σ = 1291625598. Its totient is φ = 1291625596.

The previous prime is 1291625579. The next prime is 1291625623. The reversal of 1291625597 is 7955261921.

Together with previous prime (1291625579) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 917241796 + 374383801 = 30286^2 + 19349^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291625597 - 2¹⁰ = 1291624573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1291625527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645812798 + 645812799.

It is an arithmetic number, because the mean of its divisors is an integer number (645812799).

Almost surely, 2^1291625597 is an apocalyptic number.

It is an amenable number.

1291625597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1291625597 is an equidigital number, since it uses as much as digits as its factorization.

1291625597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 340200, while the sum is 47.

The square root of 1291625597 is about 35939.1930488151. The cubic root of 1291625597 is about 1089.0443035659.

The spelling of 1291625597 in words is "one billion, two hundred ninety-one million, six hundred twenty-five thousand, five hundred ninety-seven".