1157136191 has 4 divisors (see below), whose sum is σ = 1157224800. Its totient is φ = 1157047584.

The previous prime is 1157136181. The next prime is 1157136209. The reversal of 1157136191 is 1916317511.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1157136191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1157136131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20426 + ... + 52263.

It is an arithmetic number, because the mean of its divisors is an integer number (289306200).

Almost surely, 2^1157136191 is an apocalyptic number.

1157136191 is a deficient number, since it is larger than the sum of its proper divisors (88609).

1157136191 is an equidigital number, since it uses as much as digits as its factorization.

1157136191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88608.

The product of its digits is 5670, while the sum is 35.

The square root of 1157136191 is about 34016.7045875993. The cubic root of 1157136191 is about 1049.8521911364.

The spelling of 1157136191 in words is "one billion, one hundred fifty-seven million, one hundred thirty-six thousand, one hundred ninety-one".