499563781 has 2 divisors, whose sum is σ = 499563782. Its totient is φ = 499563780.

The previous prime is 499563707. The next prime is 499563817. The reversal of 499563781 is 187365994.

It is a happy number.

Together with next prime (499563817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 415548225 + 84015556 = 20385^2 + 9166^2 .

It is a cyclic number.

It is not a de Polignac number, because 499563781 - 2¹⁷ = 499432709 is a prime.

It is a super-2 number, since 2×499563781² = 499127942574031922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499263781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249781890 + 249781891.

It is an arithmetic number, because the mean of its divisors is an integer number (249781891).

Almost surely, 2^499563781 is an apocalyptic number.

It is an amenable number.

499563781 is a deficient number, since it is larger than the sum of its proper divisors (1).

499563781 is an equidigital number, since it uses as much as digits as its factorization.

499563781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 52.

The square root of 499563781 is about 22350.9234932251. The cubic root of 499563781 is about 793.4696406602.

The spelling of 499563781 in words is "four hundred ninety-nine million, five hundred sixty-three thousand, seven hundred eighty-one".