1157491 has 2 divisors, whose sum is σ = 1157492. Its totient is φ = 1157490.

The previous prime is 1157489. The next prime is 1157503. The reversal of 1157491 is 1947511.

It is a weak prime.

It is an emirp because it is prime and its reverse (1947511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1157491 - 2¹ = 1157489 is a prime.

Together with 1157489, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1157591) 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 as a sum of consecutive naturals, namely, 578745 + 578746.

It is an arithmetic number, because the mean of its divisors is an integer number (578746).

2^1157491 is an apocalyptic number.

1157491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157491 is an equidigital number, since it uses as much as digits as its factorization.

1157491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 1157491 is about 1075.8675569047. The cubic root of 1157491 is about 104.9959484453.

The spelling of 1157491 in words is "one million, one hundred fifty-seven thousand, four hundred ninety-one".