1157694491 has 16 divisors (see below), whose sum is σ = 1250659200. Its totient is φ = 1068033600.

The previous prime is 1157694487. The next prime is 1157694497. The reversal of 1157694491 is 1944967511.

It is not a de Polignac number, because 1157694491 - 2² = 1157694487 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1157694497) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 574676 + ... + 576686.

It is an arithmetic number, because the mean of its divisors is an integer number (78166200).

Almost surely, 2^1157694491 is an apocalyptic number.

1157694491 is a deficient number, since it is larger than the sum of its proper divisors (92964709).

1157694491 is a wasteful number, since it uses less digits than its factorization.

1157694491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2810.

The product of its digits is 272160, while the sum is 47.

The square root of 1157694491 is about 34024.9098602774. The cubic root of 1157694491 is about 1050.0210097081.

The spelling of 1157694491 in words is "one billion, one hundred fifty-seven million, six hundred ninety-four thousand, four hundred ninety-one".