494438681 has 4 divisors (see below), whose sum is σ = 539387664. Its totient is φ = 449489700.

The previous prime is 494438663. The next prime is 494438683. The reversal of 494438681 is 186834494.

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.

It is a de Polignac number, because none of the positive numbers 2^k-494438681 is a prime.

It is a super-2 number, since 2×494438681² = 488939218538039522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (494438683) 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, 22474475 + ... + 22474496.

It is an arithmetic number, because the mean of its divisors is an integer number (134846916).

Almost surely, 2^494438681 is an apocalyptic number.

It is an amenable number.

494438681 is a deficient number, since it is larger than the sum of its proper divisors (44948983).

494438681 is a wasteful number, since it uses less digits than its factorization.

494438681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44948982.

The product of its digits is 663552, while the sum is 47.

The square root of 494438681 is about 22235.9771766388. The cubic root of 494438681 is about 790.7468667275.

The spelling of 494438681 in words is "four hundred ninety-four million, four hundred thirty-eight thousand, six hundred eighty-one".