499904147521 has 9 divisors (see below), whose sum is σ = 501948010083. Its totient is φ = 497868582240.

The previous prime is 499904147513. The next prime is 499904147539. The reversal of 499904147521 is 125741409994.

The square root of 499904147521 is 707039.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 240334277121 + 259569870400 = 490239^2 + 509480^2 .

It is not a de Polignac number, because 499904147521 - 2³ = 499904147513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (499904117521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 191606265 + ... + 191608873.

Almost surely, 2^499904147521 is an apocalyptic number.

499904147521 is the 707039-th square number.

499904147521 is the 353520-th centered octagonal number.

It is an amenable number.

499904147521 is a deficient number, since it is larger than the sum of its proper divisors (2043862562).

499904147521 is an frugal number, since it uses more digits than its factorization.

499904147521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5760 (or 2880 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 55.

The spelling of 499904147521 in words is "four hundred ninety-nine billion, nine hundred four million, one hundred forty-seven thousand, five hundred twenty-one".