499651261 has 2 divisors, whose sum is σ = 499651262. Its totient is φ = 499651260.

The previous prime is 499651259. The next prime is 499651291. The reversal of 499651261 is 162156994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 268763236 + 230888025 = 16394^2 + 15195^2 .

It is a cyclic number.

It is not a de Polignac number, because 499651261 - 2¹ = 499651259 is a prime.

Together with 499651259, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499651231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249825630 + 249825631.

It is an arithmetic number, because the mean of its divisors is an integer number (249825631).

Almost surely, 2^499651261 is an apocalyptic number.

It is an amenable number.

499651261 is a deficient number, since it is larger than the sum of its proper divisors (1).

499651261 is an equidigital number, since it uses as much as digits as its factorization.

499651261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 499651261 is about 22352.8803736789. The cubic root of 499651261 is about 793.5159535139.

The spelling of 499651261 in words is "four hundred ninety-nine million, six hundred fifty-one thousand, two hundred sixty-one".