499904117521 has 2 divisors, whose sum is σ = 499904117522. Its totient is φ = 499904117520.

The previous prime is 499904117519. The next prime is 499904117549. The reversal of 499904117521 is 125711409994.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 382913440000 + 116990677521 = 618800^2 + 342039^2 .

It is a cyclic number.

It is not a de Polignac number, because 499904117521 - 2¹ = 499904117519 is a prime.

Together with 499904117519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (499904117561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249952058760 + 249952058761.

It is an arithmetic number, because the mean of its divisors is an integer number (249952058761).

Almost surely, 2^499904117521 is an apocalyptic number.

It is an amenable number.

499904117521 is a deficient number, since it is larger than the sum of its proper divisors (1).

499904117521 is an equidigital number, since it uses as much as digits as its factorization.

499904117521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The spelling of 499904117521 in words is "four hundred ninety-nine billion, nine hundred four million, one hundred seventeen thousand, five hundred twenty-one".