491481389297 has 2 divisors, whose sum is σ = 491481389298. Its totient is φ = 491481389296.

The previous prime is 491481389257. The next prime is 491481389309. The reversal of 491481389297 is 792983184194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 491479515136 + 1874161 = 701056^2 + 1369^2 .

It is a cyclic number.

It is not a de Polignac number, because 491481389297 - 2¹⁸ = 491481127153 is a prime.

It is not a weakly prime, because it can be changed into another prime (491481389257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245740694648 + 245740694649.

It is an arithmetic number, because the mean of its divisors is an integer number (245740694649).

Almost surely, 2^491481389297 is an apocalyptic number.

It is an amenable number.

491481389297 is a deficient number, since it is larger than the sum of its proper divisors (1).

491481389297 is an equidigital number, since it uses as much as digits as its factorization.

491481389297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31352832, while the sum is 65.

The spelling of 491481389297 in words is "four hundred ninety-one billion, four hundred eighty-one million, three hundred eighty-nine thousand, two hundred ninety-seven".