494781021 has 32 divisors (see below), whose sum is σ = 851942400. Its totient is φ = 277933680.

The previous prime is 494781019. The next prime is 494781043. The reversal of 494781021 is 120187494.

It is not a de Polignac number, because 494781021 - 2¹ = 494781019 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (494781061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11035 + ... + 33336.

It is an arithmetic number, because the mean of its divisors is an integer number (26623200).

Almost surely, 2^494781021 is an apocalyptic number.

It is an amenable number.

494781021 is a deficient number, since it is larger than the sum of its proper divisors (357161379).

494781021 is a wasteful number, since it uses less digits than its factorization.

494781021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44446 (or 44440 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 494781021 is about 22243.6737298496. The cubic root of 494781021 is about 790.9293240203.

The spelling of 494781021 in words is "four hundred ninety-four million, seven hundred eighty-one thousand, twenty-one".