521243131 has 8 divisors (see below), whose sum is σ = 548886800. Its totient is φ = 493620480.

The previous prime is 521243101. The next prime is 521243143. The reversal of 521243131 is 131342125.

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 521243131 - 2¹⁵ = 521210363 is a prime.

It is a super-2 number, since 2×521243131² = 543388803229366322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521243101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91651 + ... + 97171.

It is an arithmetic number, because the mean of its divisors is an integer number (68610850).

Almost surely, 2^521243131 is an apocalyptic number.

521243131 is a deficient number, since it is larger than the sum of its proper divisors (27643669).

521243131 is a wasteful number, since it uses less digits than its factorization.

521243131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10509.

The product of its digits is 720, while the sum is 22.

The square root of 521243131 is about 22830.7496810771. The cubic root of 521243131 is about 804.7854480106.

Adding to 521243131 its reverse (131342125), we get a palindrome (652585256).

It can be divided in two parts, 52124 and 3131, that added together give a palindrome (55255).

The spelling of 521243131 in words is "five hundred twenty-one million, two hundred forty-three thousand, one hundred thirty-one".