521111431 has 8 divisors (see below), whose sum is σ = 523152000. Its totient is φ = 519075960.

The previous prime is 521111407. The next prime is 521111443. The reversal of 521111431 is 134111125.

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 521111431 - 2¹⁹ = 520587143 is a prime.

It is a super-2 number, since 2×521111431² = 543114247037735522, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 521111399 and 521111408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521111831) 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, 413280 + ... + 414538.

It is an arithmetic number, because the mean of its divisors is an integer number (65394000).

Almost surely, 2^521111431 is an apocalyptic number.

521111431 is a deficient number, since it is larger than the sum of its proper divisors (2040569).

521111431 is a wasteful number, since it uses less digits than its factorization.

521111431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2549.

The product of its digits is 120, while the sum is 19.

The square root of 521111431 is about 22827.8652308971. The cubic root of 521111431 is about 804.7176618758.

Adding to 521111431 its reverse (134111125), we get a palindrome (655222556).

The spelling of 521111431 in words is "five hundred twenty-one million, one hundred eleven thousand, four hundred thirty-one".