520396981 has 8 divisors (see below), whose sum is σ = 561302784. Its totient is φ = 479616240.

The previous prime is 520396939. The next prime is 520396993. The reversal of 520396981 is 189693025.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 520396981 - 2²³ = 512008373 is a prime.

It is a super-2 number, since 2×520396981² = 541626035667828722, 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 (520396931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22525 + ... + 39346.

It is an arithmetic number, because the mean of its divisors is an integer number (70162848).

Almost surely, 2^520396981 is an apocalyptic number.

It is an amenable number.

520396981 is a deficient number, since it is larger than the sum of its proper divisors (40905803).

520396981 is a wasteful number, since it uses less digits than its factorization.

520396981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62531.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 520396981 is about 22812.2112255695. The cubic root of 520396981 is about 804.3497345029.

The spelling of 520396981 in words is "five hundred twenty million, three hundred ninety-six thousand, nine hundred eighty-one".