1157643797 has 4 divisors (see below), whose sum is σ = 1207976160. Its totient is φ = 1107311436.

The previous prime is 1157643791. The next prime is 1157643803. The reversal of 1157643797 is 7973467511.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7973467511 = 43 ⋅185429477.

It is an interprime number because it is at equal distance from previous prime (1157643791) and next prime (1157643803).

It is a cyclic number.

It is not a de Polignac number, because 1157643797 - 2³⁰ = 83901973 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 (1157643791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25166147 + ... + 25166192.

It is an arithmetic number, because the mean of its divisors is an integer number (301994040).

Almost surely, 2^1157643797 is an apocalyptic number.

It is an amenable number.

1157643797 is a deficient number, since it is larger than the sum of its proper divisors (50332363).

1157643797 is an equidigital number, since it uses as much as digits as its factorization.

1157643797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50332362.

The product of its digits is 1111320, while the sum is 50.

The square root of 1157643797 is about 34024.1648979075. The cubic root of 1157643797 is about 1050.0056831136.

The spelling of 1157643797 in words is "one billion, one hundred fifty-seven million, six hundred forty-three thousand, seven hundred ninety-seven".