1157839391 has 2 divisors, whose sum is σ = 1157839392. Its totient is φ = 1157839390.

The previous prime is 1157839363. The next prime is 1157839393. The reversal of 1157839391 is 1939387511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157839391 is a prime.

Together with 1157839393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157839393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578919695 + 578919696.

It is an arithmetic number, because the mean of its divisors is an integer number (578919696).

Almost surely, 2^1157839391 is an apocalyptic number.

1157839391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157839391 is an equidigital number, since it uses as much as digits as its factorization.

1157839391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 1157839391 is about 34027.0391159736. The cubic root of 1157839391 is about 1050.0648156512.

The spelling of 1157839391 in words is "one billion, one hundred fifty-seven million, eight hundred thirty-nine thousand, three hundred ninety-one".