521131 has 4 divisors (see below), whose sum is σ = 561232. Its totient is φ = 481032.

The previous prime is 521119. The next prime is 521137. The reversal of 521131 is 131125.

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

It is a cyclic number.

It is not a de Polignac number, because 521131 - 2¹¹ = 519083 is a prime.

It is a super-2 number, since 2×521131² = 543155038322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 40087 = 521131 / (5 + 2 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521137) 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, 20031 + ... + 20056.

It is an arithmetic number, because the mean of its divisors is an integer number (140308).

2⁵²¹¹³¹ is an apocalyptic number.

521131 is a deficient number, since it is larger than the sum of its proper divisors (40101).

521131 is a wasteful number, since it uses less digits than its factorization.

521131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40100.

The product of its digits is 30, while the sum is 13.

The square root of 521131 is about 721.8940365455. The cubic root of 521131 is about 80.4727734784.

Adding to 521131 its reverse (131125), we get a palindrome (652256).

The spelling of 521131 in words is "five hundred twenty-one thousand, one hundred thirty-one".