491627089 has 2 divisors, whose sum is σ = 491627090. Its totient is φ = 491627088.

The previous prime is 491627069. The next prime is 491627167. The reversal of 491627089 is 980726194.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 276124689 + 215502400 = 16617^2 + 14680^2 .

It is a cyclic number.

It is not a de Polignac number, because 491627089 - 2¹¹ = 491625041 is a prime.

It is a super-2 number, since 2×491627089² = 483394389277227842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (491627069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245813544 + 245813545.

It is an arithmetic number, because the mean of its divisors is an integer number (245813545).

Almost surely, 2^491627089 is an apocalyptic number.

It is an amenable number.

491627089 is a deficient number, since it is larger than the sum of its proper divisors (1).

491627089 is an equidigital number, since it uses as much as digits as its factorization.

491627089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 491627089 is about 22172.6653562444. The cubic root of 491627089 is about 789.2451739001.

The spelling of 491627089 in words is "four hundred ninety-one million, six hundred twenty-seven thousand, eighty-nine".