491651683189 has 2 divisors, whose sum is σ = 491651683190. Its totient is φ = 491651683188.

The previous prime is 491651683181. The next prime is 491651683223. The reversal of 491651683189 is 981386156194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302261347089 + 189390336100 = 549783^2 + 435190^2 .

It is a cyclic number.

It is not a de Polignac number, because 491651683189 - 2³ = 491651683181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (491651683181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245825841594 + 245825841595.

It is an arithmetic number, because the mean of its divisors is an integer number (245825841595).

Almost surely, 2^491651683189 is an apocalyptic number.

It is an amenable number.

491651683189 is a deficient number, since it is larger than the sum of its proper divisors (1).

491651683189 is an equidigital number, since it uses as much as digits as its factorization.

491651683189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11197440, while the sum is 61.

The spelling of 491651683189 in words is "four hundred ninety-one billion, six hundred fifty-one million, six hundred eighty-three thousand, one hundred eighty-nine".