520978811 has 4 divisors (see below), whose sum is σ = 524727000. Its totient is φ = 517230624.

The previous prime is 520978793. The next prime is 520978813. The reversal of 520978811 is 118879025.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-520978811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (520978813) 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, 1873886 + ... + 1874163.

It is an arithmetic number, because the mean of its divisors is an integer number (131181750).

Almost surely, 2^520978811 is an apocalyptic number.

520978811 is a deficient number, since it is larger than the sum of its proper divisors (3748189).

520978811 is a wasteful number, since it uses less digits than its factorization.

520978811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748188.

The product of its (nonzero) digits is 40320, while the sum is 41.

The square root of 520978811 is about 22824.9602628351. The cubic root of 520978811 is about 804.6493906740.

The spelling of 520978811 in words is "five hundred twenty million, nine hundred seventy-eight thousand, eight hundred eleven".