5142721 has 4 divisors (see below), whose sum is σ = 5445252. Its totient is φ = 4840192.

The previous prime is 5142713. The next prime is 5142733. The reversal of 5142721 is 1272415.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4601025 + 541696 = 2145^2 + 736^2 .

It is a cyclic number.

It is not a de Polignac number, because 5142721 - 2³ = 5142713 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5142692 and 5142701.

It is not an unprimeable number, because it can be changed into a prime (5142751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151240 + ... + 151273.

It is an arithmetic number, because the mean of its divisors is an integer number (1361313).

Almost surely, 2^5142721 is an apocalyptic number.

It is an amenable number.

5142721 is a deficient number, since it is larger than the sum of its proper divisors (302531).

5142721 is a wasteful number, since it uses less digits than its factorization.

5142721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302530.

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

The square root of 5142721 is about 2267.7568211781. The cubic root of 5142721 is about 172.6093516549.

The spelling of 5142721 in words is "five million, one hundred forty-two thousand, seven hundred twenty-one".