971291663 has 2 divisors, whose sum is σ = 971291664. Its totient is φ = 971291662.

The previous prime is 971291641. The next prime is 971291669. The reversal of 971291663 is 366192179.

It is a strong prime.

It is an emirp because it is prime and its reverse (366192179) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 971291663 - 2⁸ = 971291407 is a prime.

It is a super-2 number, since 2×971291663² = 1886814989226611138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (971291669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 485645831 + 485645832.

It is an arithmetic number, because the mean of its divisors is an integer number (485645832).

Almost surely, 2^971291663 is an apocalyptic number.

971291663 is a deficient number, since it is larger than the sum of its proper divisors (1).

971291663 is an equidigital number, since it uses as much as digits as its factorization.

971291663 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 44.

The square root of 971291663 is about 31165.5525059319. The cubic root of 971291663 is about 990.3374909629.

The spelling of 971291663 in words is "nine hundred seventy-one million, two hundred ninety-one thousand, six hundred sixty-three".