521217164 has 12 divisors (see below), whose sum is σ = 982293984. Its totient is φ = 240561744.

The previous prime is 521217163. The next prime is 521217173. The reversal of 521217164 is 461712125.

It is not an unprimeable number, because it can be changed into a prime (521217163) 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, 5011652 + ... + 5011755.

It is an arithmetic number, because the mean of its divisors is an integer number (81857832).

Almost surely, 2^521217164 is an apocalyptic number.

It is an amenable number.

521217164 is a deficient number, since it is larger than the sum of its proper divisors (461076820).

521217164 is a wasteful number, since it uses less digits than its factorization.

521217164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10023424 (or 10023422 counting only the distinct ones).

The product of its digits is 3360, while the sum is 29.

The square root of 521217164 is about 22830.1809892081. The cubic root of 521217164 is about 804.7720836710.

Adding to 521217164 its reverse (461712125), we get a palindrome (982929289).

The spelling of 521217164 in words is "five hundred twenty-one million, two hundred seventeen thousand, one hundred sixty-four".