491271097 has 2 divisors, whose sum is σ = 491271098. Its totient is φ = 491271096.

The previous prime is 491271019. The next prime is 491271103. The reversal of 491271097 is 790172194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444197776 + 47073321 = 21076^2 + 6861^2 .

It is a cyclic number.

It is not a de Polignac number, because 491271097 - 2¹⁵ = 491238329 is a prime.

It is not a weakly prime, because it can be changed into another prime (491271017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245635548 + 245635549.

It is an arithmetic number, because the mean of its divisors is an integer number (245635549).

Almost surely, 2^491271097 is an apocalyptic number.

It is an amenable number.

491271097 is a deficient number, since it is larger than the sum of its proper divisors (1).

491271097 is an equidigital number, since it uses as much as digits as its factorization.

491271097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 40.

The square root of 491271097 is about 22164.6361801858. The cubic root of 491271097 is about 789.0546278419.

The spelling of 491271097 in words is "four hundred ninety-one million, two hundred seventy-one thousand, ninety-seven".