4512721 has 4 divisors (see below), whose sum is σ = 4617712. Its totient is φ = 4407732.

The previous prime is 4512713. The next prime is 4512727. The reversal of 4512721 is 1272154.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4512721 - 2³ = 4512713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4512692 and 4512701.

It is not an unprimeable number, because it can be changed into a prime (4512727) 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, 52431 + ... + 52516.

It is an arithmetic number, because the mean of its divisors is an integer number (1154428).

Almost surely, 2^4512721 is an apocalyptic number.

It is an amenable number.

4512721 is a deficient number, since it is larger than the sum of its proper divisors (104991).

4512721 is a wasteful number, since it uses less digits than its factorization.

4512721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104990.

The product of its digits is 560, while the sum is 22.

The square root of 4512721 is about 2124.3165959903. The cubic root of 4512721 is about 165.2517857726.

Adding to 4512721 its reverse (1272154), we get a palindrome (5784875).

The spelling of 4512721 in words is "four million, five hundred twelve thousand, seven hundred twenty-one".