491100817 has 2 divisors, whose sum is σ = 491100818. Its totient is φ = 491100816.

The previous prime is 491100793. The next prime is 491100833. The reversal of 491100817 is 718001194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 456420496 + 34680321 = 21364^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 491100817 - 2²⁷ = 356883089 is a prime.

It is not a weakly prime, because it can be changed into another prime (491100217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245550408 + 245550409.

It is an arithmetic number, because the mean of its divisors is an integer number (245550409).

Almost surely, 2^491100817 is an apocalyptic number.

It is an amenable number.

491100817 is a deficient number, since it is larger than the sum of its proper divisors (1).

491100817 is an equidigital number, since it uses as much as digits as its factorization.

491100817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 491100817 is about 22160.7945931548. The cubic root of 491100817 is about 788.9634522843.

The spelling of 491100817 in words is "four hundred ninety-one million, one hundred thousand, eight hundred seventeen".