991176491 has 2 divisors, whose sum is σ = 991176492. Its totient is φ = 991176490.

The previous prime is 991176469. The next prime is 991176497. The reversal of 991176491 is 194671199.

991176491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 991176491 - 2⁶ = 991176427 is a prime.

It is a super-2 number, since 2×991176491² = 1964861672622146162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (991176497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495588245 + 495588246.

It is an arithmetic number, because the mean of its divisors is an integer number (495588246).

Almost surely, 2^991176491 is an apocalyptic number.

991176491 is a deficient number, since it is larger than the sum of its proper divisors (1).

991176491 is an equidigital number, since it uses as much as digits as its factorization.

991176491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 991176491 is about 31482.9555632885. The cubic root of 991176491 is about 997.0501371991.

The spelling of 991176491 in words is "nine hundred ninety-one million, one hundred seventy-six thousand, four hundred ninety-one".