499431681 has 12 divisors (see below), whose sum is σ = 824458752. Its totient is φ = 285389496.

The previous prime is 499431677. The next prime is 499431689. The reversal of 499431681 is 186134994.

It is not a de Polignac number, because 499431681 - 2² = 499431677 is a prime.

It is a super-2 number, since 2×499431681² = 498864007972971522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (499431689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3963681 + ... + 3963806.

It is an arithmetic number, because the mean of its divisors is an integer number (68704896).

Almost surely, 2^499431681 is an apocalyptic number.

It is an amenable number.

499431681 is a deficient number, since it is larger than the sum of its proper divisors (325027071).

499431681 is a wasteful number, since it uses less digits than its factorization.

499431681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7927500 (or 7927497 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 499431681 is about 22347.9681626764. The cubic root of 499431681 is about 793.3996952506.

The spelling of 499431681 in words is "four hundred ninety-nine million, four hundred thirty-one thousand, six hundred eighty-one".