491806061 has 2 divisors, whose sum is σ = 491806062. Its totient is φ = 491806060.

The previous prime is 491806043. The next prime is 491806153. The reversal of 491806061 is 160608194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328733161 + 163072900 = 18131^2 + 12770^2 .

It is a cyclic number.

It is not a de Polignac number, because 491806061 - 2⁶ = 491805997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491806031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245903030 + 245903031.

It is an arithmetic number, because the mean of its divisors is an integer number (245903031).

Almost surely, 2^491806061 is an apocalyptic number.

It is an amenable number.

491806061 is a deficient number, since it is larger than the sum of its proper divisors (1).

491806061 is an equidigital number, since it uses as much as digits as its factorization.

491806061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 491806061 is about 22176.7008592351. The cubic root of 491806061 is about 789.3409345917.

The spelling of 491806061 in words is "four hundred ninety-one million, eight hundred six thousand, sixty-one".