1291243180597 has 4 divisors (see below), whose sum is σ = 1297362816736. Its totient is φ = 1285123544460.

The previous prime is 1291243180547. The next prime is 1291243180673. The reversal of 1291243180597 is 7950813421921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1291243180597 - 2²³ = 1291234791989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1291243180517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3059817753 + ... + 3059818174.

It is an arithmetic number, because the mean of its divisors is an integer number (324340704184).

Almost surely, 2^{1291243180597} is an apocalyptic number.

It is an amenable number.

1291243180597 is a deficient number, since it is larger than the sum of its proper divisors (6119636139).

1291243180597 is an equidigital number, since it uses as much as digits as its factorization.

1291243180597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6119636138.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 1291243180597 in words is "one trillion, two hundred ninety-one billion, two hundred forty-three million, one hundred eighty thousand, five hundred ninety-seven".