491807101 has 2 divisors, whose sum is σ = 491807102. Its totient is φ = 491807100.

The previous prime is 491807047. The next prime is 491807111. The reversal of 491807101 is 101708194.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356643225 + 135163876 = 18885^2 + 11626^2 .

It is a cyclic number.

It is not a de Polignac number, because 491807101 - 2²¹ = 489709949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491807111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245903550 + 245903551.

It is an arithmetic number, because the mean of its divisors is an integer number (245903551).

Almost surely, 2^491807101 is an apocalyptic number.

It is an amenable number.

491807101 is a deficient number, since it is larger than the sum of its proper divisors (1).

491807101 is an equidigital number, since it uses as much as digits as its factorization.

491807101 is an odious number, because the sum of its binary digits is odd.

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

The square root of 491807101 is about 22176.7243072551. The cubic root of 491807101 is about 789.3414909858.

The spelling of 491807101 in words is "four hundred ninety-one million, eight hundred seven thousand, one hundred one".