9491494997 has 2 divisors, whose sum is σ = 9491494998. Its totient is φ = 9491494996.

The previous prime is 9491494949. The next prime is 9491495017. The reversal of 9491494997 is 7994941949.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9095246161 + 396248836 = 95369^2 + 19906^2 .

It is a cyclic number.

It is not a de Polignac number, because 9491494997 - 2⁸ = 9491494741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9491494297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4745747498 + 4745747499.

It is an arithmetic number, because the mean of its divisors is an integer number (4745747499).

Almost surely, 2^9491494997 is an apocalyptic number.

It is an amenable number.

9491494997 is a deficient number, since it is larger than the sum of its proper divisors (1).

9491494997 is an equidigital number, since it uses as much as digits as its factorization.

9491494997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 65.

The square root of 9491494997 is about 97424.3039338747. The cubic root of 9491494997 is about 2117.2795737332.

The spelling of 9491494997 in words is "nine billion, four hundred ninety-one million, four hundred ninety-four thousand, nine hundred ninety-seven".