521343442 has 16 divisors (see below), whose sum is σ = 788431392. Its totient is φ = 258541920.

The previous prime is 521343419. The next prime is 521343479. The reversal of 521343442 is 244343125.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 521343442.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130113 + ... + 134059.

It is an arithmetic number, because the mean of its divisors is an integer number (49276962).

Almost surely, 2^521343442 is an apocalyptic number.

521343442 is a deficient number, since it is larger than the sum of its proper divisors (267087950).

521343442 is a wasteful number, since it uses less digits than its factorization.

521343442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473.

The product of its digits is 11520, while the sum is 28.

The square root of 521343442 is about 22832.9464152133. The cubic root of 521343442 is about 804.8370705326.

Adding to 521343442 its reverse (244343125), we get a palindrome (765686567).

The spelling of 521343442 in words is "five hundred twenty-one million, three hundred forty-three thousand, four hundred forty-two".