499451681 has 2 divisors, whose sum is σ = 499451682. Its totient is φ = 499451680.

The previous prime is 499451671. The next prime is 499451683. The reversal of 499451681 is 186154994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 480311056 + 19140625 = 21916^2 + 4375^2 .

It is a cyclic number.

It is not a de Polignac number, because 499451681 - 2¹⁴ = 499435297 is a prime.

It is a super-3 number, since 3×499451681³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 499451683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (499451683) 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 as a sum of consecutive naturals, namely, 249725840 + 249725841.

It is an arithmetic number, because the mean of its divisors is an integer number (249725841).

Almost surely, 2^499451681 is an apocalyptic number.

It is an amenable number.

499451681 is a deficient number, since it is larger than the sum of its proper divisors (1).

499451681 is an equidigital number, since it uses as much as digits as its factorization.

499451681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 47.

The square root of 499451681 is about 22348.4156261691. The cubic root of 499451681 is about 793.4102858096.

The spelling of 499451681 in words is "four hundred ninety-nine million, four hundred fifty-one thousand, six hundred eighty-one".