494481989 has 4 divisors (see below), whose sum is σ = 499103424. Its totient is φ = 489860556.

The previous prime is 494481947. The next prime is 494482013. The reversal of 494481989 is 989184494.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 989184494 = 2 ⋅494592247.

It is a cyclic number.

It is not a de Polignac number, because 494481989 - 2⁸ = 494481733 is a prime.

It is a super-2 number, since 2×494481989² = 489024874890792242, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494484989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2310557 + ... + 2310770.

It is an arithmetic number, because the mean of its divisors is an integer number (124775856).

Almost surely, 2^494481989 is an apocalyptic number.

It is an amenable number.

494481989 is a deficient number, since it is larger than the sum of its proper divisors (4621435).

494481989 is a wasteful number, since it uses less digits than its factorization.

494481989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4621434.

The product of its digits is 2985984, while the sum is 56.

The square root of 494481989 is about 22236.9509825425. The cubic root of 494481989 is about 790.7699532880.

The spelling of 494481989 in words is "four hundred ninety-four million, four hundred eighty-one thousand, nine hundred eighty-nine".