499319021 has 2 divisors, whose sum is σ = 499319022. Its totient is φ = 499319020.

The previous prime is 499319017. The next prime is 499319027. The reversal of 499319021 is 120913994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 291555625 + 207763396 = 17075^2 + 14414^2 .

It is a cyclic number.

It is not a de Polignac number, because 499319021 - 2² = 499319017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499319027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249659510 + 249659511.

It is an arithmetic number, because the mean of its divisors is an integer number (249659511).

Almost surely, 2^499319021 is an apocalyptic number.

It is an amenable number.

499319021 is a deficient number, since it is larger than the sum of its proper divisors (1).

499319021 is an equidigital number, since it uses as much as digits as its factorization.

499319021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 499319021 is about 22345.4474334259. The cubic root of 499319021 is about 793.3400333489.

The spelling of 499319021 in words is "four hundred ninety-nine million, three hundred nineteen thousand, twenty-one".