521381 has 8 divisors (see below), whose sum is σ = 600384. Its totient is φ = 443520.

The previous prime is 521377. The next prime is 521393. The reversal of 521381 is 183125.

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

It is not a de Polignac number, because 521381 - 2² = 521377 is a prime.

It is a super-2 number, since 2×521381² = 543676294322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 521381.

It is not an unprimeable number, because it can be changed into a prime (521281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301 + ... + 1653.

It is an arithmetic number, because the mean of its divisors is an integer number (75048).

2⁵²¹³⁸¹ is an apocalyptic number.

It is an amenable number.

521381 is a deficient number, since it is larger than the sum of its proper divisors (79003).

521381 is a wasteful number, since it uses less digits than its factorization.

521381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571.

The product of its digits is 240, while the sum is 20.

The square root of 521381 is about 722.0671713906. The cubic root of 521381 is about 80.4856397105.

The spelling of 521381 in words is "five hundred twenty-one thousand, three hundred eighty-one".