491122901989 has 8 divisors (see below), whose sum is σ = 499642748640. Its totient is φ = 482638045296.

The previous prime is 491122901987. The next prime is 491122901999. The reversal of 491122901989 is 989109221194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491122901989 - 2¹ = 491122901987 is a prime.

It is a super-2 number, since 2×491122901989² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491122901987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8719174 + ... + 8775319.

It is an arithmetic number, because the mean of its divisors is an integer number (62455343580).

Almost surely, 2^491122901989 is an apocalyptic number.

It is an amenable number.

491122901989 is a deficient number, since it is larger than the sum of its proper divisors (8519846651).

491122901989 is a wasteful number, since it uses less digits than its factorization.

491122901989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17494979.

The product of its (nonzero) digits is 839808, while the sum is 55.

The spelling of 491122901989 in words is "four hundred ninety-one billion, one hundred twenty-two million, nine hundred one thousand, nine hundred eighty-nine".