1157809399 has 2 divisors, whose sum is σ = 1157809400. Its totient is φ = 1157809398.

The previous prime is 1157809391. The next prime is 1157809409. The reversal of 1157809399 is 9939087511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1157809399 - 2³ = 1157809391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157809391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578904699 + 578904700.

It is an arithmetic number, because the mean of its divisors is an integer number (578904700).

Almost surely, 2^1157809399 is an apocalyptic number.

1157809399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157809399 is an equidigital number, since it uses as much as digits as its factorization.

1157809399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 612360, while the sum is 52.

The square root of 1157809399 is about 34026.5984047774. The cubic root of 1157809399 is about 1050.0557488163.

The spelling of 1157809399 in words is "one billion, one hundred fifty-seven million, eight hundred nine thousand, three hundred ninety-nine".