520998805 has 4 divisors (see below), whose sum is σ = 625198572. Its totient is φ = 416799040.

The previous prime is 520998799. The next prime is 520998809. The reversal of 520998805 is 508899025.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67223601 + 453775204 = 8199^2 + 21302^2 .

It is a de Polignac number, because none of the positive numbers 2^k-520998805 is a prime.

It is a super-2 number, since 2×520998805² = 542879509622856050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520998809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52099876 + ... + 52099885.

It is an arithmetic number, because the mean of its divisors is an integer number (156299643).

Almost surely, 2^520998805 is an apocalyptic number.

It is an amenable number.

520998805 is a deficient number, since it is larger than the sum of its proper divisors (104199767).

520998805 is a wasteful number, since it uses less digits than its factorization.

520998805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104199766.

The product of its (nonzero) digits is 259200, while the sum is 46.

The square root of 520998805 is about 22825.3982440614. The cubic root of 520998805 is about 804.6596840895.

The spelling of 520998805 in words is "five hundred twenty million, nine hundred ninety-eight thousand, eight hundred five".