1171940491 has 2 divisors, whose sum is σ = 1171940492. Its totient is φ = 1171940490.

The previous prime is 1171940453. The next prime is 1171940503. The reversal of 1171940491 is 1940491711.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1171940491 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1171940491.

It is not a weakly prime, because it can be changed into another prime (1171940411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 585970245 + 585970246.

It is an arithmetic number, because the mean of its divisors is an integer number (585970246).

Almost surely, 2^1171940491 is an apocalyptic number.

1171940491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1171940491 is an equidigital number, since it uses as much as digits as its factorization.

1171940491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 1171940491 is about 34233.6163879892. The cubic root of 1171940491 is about 1054.3104711720.

The spelling of 1171940491 in words is "one billion, one hundred seventy-one million, nine hundred forty thousand, four hundred ninety-one".