499498781 has 2 divisors, whose sum is σ = 499498782. Its totient is φ = 499498780.

The previous prime is 499498757. The next prime is 499498817. The reversal of 499498781 is 187894994.

Together with next prime (499498817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 282408025 + 217090756 = 16805^2 + 14734^2 .

It is a cyclic number.

It is not a de Polignac number, because 499498781 - 2⁶ = 499498717 is a prime.

It is a super-2 number, since 2×499498781² = 498998064440971922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 499498781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499498711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249749390 + 249749391.

It is an arithmetic number, because the mean of its divisors is an integer number (249749391).

Almost surely, 2^499498781 is an apocalyptic number.

It is an amenable number.

499498781 is a deficient number, since it is larger than the sum of its proper divisors (1).

499498781 is an equidigital number, since it uses as much as digits as its factorization.

499498781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 499498781 is about 22349.4693673027. The cubic root of 499498781 is about 793.4352254593.

The spelling of 499498781 in words is "four hundred ninety-nine million, four hundred ninety-eight thousand, seven hundred eighty-one".