521243612 has 6 divisors (see below), whose sum is σ = 912176328. Its totient is φ = 260621804.

The previous prime is 521243539. The next prime is 521243623. The reversal of 521243612 is 216342125.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65155448 + ... + 65155455.

It is an arithmetic number, because the mean of its divisors is an integer number (152029388).

Almost surely, 2^521243612 is an apocalyptic number.

It is an amenable number.

521243612 is a deficient number, since it is larger than the sum of its proper divisors (390932716).

521243612 is a wasteful number, since it uses less digits than its factorization.

521243612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130310907 (or 130310905 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 521243612 is about 22830.7602151133. The cubic root of 521243612 is about 804.7856955609.

Adding to 521243612 its reverse (216342125), we get a palindrome (737585737).

The spelling of 521243612 in words is "five hundred twenty-one million, two hundred forty-three thousand, six hundred twelve".