1161117791 has 2 divisors, whose sum is σ = 1161117792. Its totient is φ = 1161117790.

The previous prime is 1161117761. The next prime is 1161117823. The reversal of 1161117791 is 1977111611.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161117791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161117761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580558895 + 580558896.

It is an arithmetic number, because the mean of its divisors is an integer number (580558896).

Almost surely, 2^1161117791 is an apocalyptic number.

1161117791 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161117791 is an equidigital number, since it uses as much as digits as its factorization.

1161117791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2646, while the sum is 35.

The square root of 1161117791 is about 34075.1785175074. The cubic root of 1161117791 is about 1051.0549611656.

The spelling of 1161117791 in words is "one billion, one hundred sixty-one million, one hundred seventeen thousand, seven hundred ninety-one".