1161111157 has 2 divisors, whose sum is σ = 1161111158. Its totient is φ = 1161111156.

The previous prime is 1161111137. The next prime is 1161111163. The reversal of 1161111157 is 7511111611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1039030756 + 122080401 = 32234^2 + 11049^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161111157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161111137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580555578 + 580555579.

It is an arithmetic number, because the mean of its divisors is an integer number (580555579).

Almost surely, 2^1161111157 is an apocalyptic number.

It is an amenable number.

1161111157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161111157 is an equidigital number, since it uses as much as digits as its factorization.

1161111157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 210, while the sum is 25.

The square root of 1161111157 is about 34075.0811737845. The cubic root of 1161111157 is about 1051.0529594417.

Adding to 1161111157 its reverse (7511111611), we get a palindrome (8672222768).

The spelling of 1161111157 in words is "one billion, one hundred sixty-one million, one hundred eleven thousand, one hundred fifty-seven".