1157818399 has 2 divisors, whose sum is σ = 1157818400. Its totient is φ = 1157818398.

The previous prime is 1157818397. The next prime is 1157818421. The reversal of 1157818399 is 9938187511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1157818399 - 2¹ = 1157818397 is a prime.

Together with 1157818397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157818397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578909199 + 578909200.

It is an arithmetic number, because the mean of its divisors is an integer number (578909200).

Almost surely, 2^1157818399 is an apocalyptic number.

1157818399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157818399 is an equidigital number, since it uses as much as digits as its factorization.

1157818399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 544320, while the sum is 52.

The square root of 1157818399 is about 34026.7306540020. The cubic root of 1157818399 is about 1050.0584696087.

The spelling of 1157818399 in words is "one billion, one hundred fifty-seven million, eight hundred eighteen thousand, three hundred ninety-nine".