5125721 has 16 divisors (see below), whose sum is σ = 5786640. Its totient is φ = 4515840.

The previous prime is 5125709. The next prime is 5125723. The reversal of 5125721 is 1275215.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1081600 + 4044121 = 1040^2 + 2011^2 .

It is a cyclic number.

It is not a de Polignac number, because 5125721 - 2¹⁸ = 4863577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5125723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18101 + ... + 18381.

It is an arithmetic number, because the mean of its divisors is an integer number (361665).

Almost surely, 2^5125721 is an apocalyptic number.

It is an amenable number.

5125721 is a deficient number, since it is larger than the sum of its proper divisors (660919).

5125721 is a wasteful number, since it uses less digits than its factorization.

5125721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364.

The product of its digits is 700, while the sum is 23.

The square root of 5125721 is about 2264.0055211947. The cubic root of 5125721 is about 172.4189467283.

The spelling of 5125721 in words is "five million, one hundred twenty-five thousand, seven hundred twenty-one".