520355381 has 32 divisors (see below), whose sum is σ = 691407360. Its totient is φ = 380185344.

The previous prime is 520355371. The next prime is 520355387. The reversal of 520355381 is 183553025.

It is not a de Polignac number, because 520355381 - 2⁶ = 520355317 is a prime.

It is a super-2 number, since 2×520355381² = 541539445071310322, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520355387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56411 + ... + 64983.

It is an arithmetic number, because the mean of its divisors is an integer number (21606480).

Almost surely, 2^520355381 is an apocalyptic number.

It is an amenable number.

520355381 is a deficient number, since it is larger than the sum of its proper divisors (171051979).

520355381 is a wasteful number, since it uses less digits than its factorization.

520355381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8645.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 520355381 is about 22811.2994149829. The cubic root of 520355381 is about 804.3283009680.

The spelling of 520355381 in words is "five hundred twenty million, three hundred fifty-five thousand, three hundred eighty-one".