5121664 has 16 divisors (see below), whose sum is σ = 10203570. Its totient is φ = 2560768.

The previous prime is 5121653. The next prime is 5121667. The reversal of 5121664 is 4661215.

It can be written as a sum of positive squares in only one way, i.e., 4494400 + 627264 = 2120^2 + 792^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is not an unprimeable number, because it can be changed into a prime (5121667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19879 + ... + 20134.

Almost surely, 2^5121664 is an apocalyptic number.

It is an amenable number.

5121664 is a deficient number, since it is larger than the sum of its proper divisors (5081906).

5121664 is an equidigital number, since it uses as much as digits as its factorization.

5121664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40027 (or 40015 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 5121664 is about 2263.1093654528. The cubic root of 5121664 is about 172.3734449475.

Adding to 5121664 its reverse (4661215), we get a palindrome (9782879).

The spelling of 5121664 in words is "five million, one hundred twenty-one thousand, six hundred sixty-four".