1231745597 has 2 divisors, whose sum is σ = 1231745598. Its totient is φ = 1231745596.

The previous prime is 1231745579. The next prime is 1231745617. The reversal of 1231745597 is 7955471321.

Together with previous prime (1231745579) 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., 789947236 + 441798361 = 28106^2 + 21019^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231745597 - 2⁸ = 1231745341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231745297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615872798 + 615872799.

It is an arithmetic number, because the mean of its divisors is an integer number (615872799).

Almost surely, 2^1231745597 is an apocalyptic number.

It is an amenable number.

1231745597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231745597 is an equidigital number, since it uses as much as digits as its factorization.

1231745597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 44.

The square root of 1231745597 is about 35096.2333733978. The cubic root of 1231745597 is about 1071.9478877379.

The spelling of 1231745597 in words is "one billion, two hundred thirty-one million, seven hundred forty-five thousand, five hundred ninety-seven".