1171391041 has 2 divisors, whose sum is σ = 1171391042. Its totient is φ = 1171391040.

The previous prime is 1171390981. The next prime is 1171391047. The reversal of 1171391041 is 1401931711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 812478016 + 358913025 = 28504^2 + 18945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171391041 - 2¹⁵ = 1171358273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1171391047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585695520 + 585695521.

It is an arithmetic number, because the mean of its divisors is an integer number (585695521).

Almost surely, 2^1171391041 is an apocalyptic number.

It is an amenable number.

1171391041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171391041 is an equidigital number, since it uses as much as digits as its factorization.

1171391041 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 1171391041 is about 34225.5904404877. The cubic root of 1171391041 is about 1054.1456785488.

The spelling of 1171391041 in words is "one billion, one hundred seventy-one million, three hundred ninety-one thousand, forty-one".