1157171111 has 2 divisors, whose sum is σ = 1157171112. Its totient is φ = 1157171110.

The previous prime is 1157171087. The next prime is 1157171149. The reversal of 1157171111 is 1111717511.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1157171111 - 2¹⁰ = 1157170087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1157171711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 578585555 + 578585556.

It is an arithmetic number, because the mean of its divisors is an integer number (578585556).

Almost surely, 2^1157171111 is an apocalyptic number.

1157171111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1157171111 is an equidigital number, since it uses as much as digits as its factorization.

1157171111 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245, while the sum is 26.

The square root of 1157171111 is about 34017.2178609598. The cubic root of 1157171111 is about 1049.8627518264.

Adding to 1157171111 its reverse (1111717511), we get a palindrome (2268888622).

The spelling of 1157171111 in words is "one billion, one hundred fifty-seven million, one hundred seventy-one thousand, one hundred eleven".