5187421 has 4 divisors (see below), whose sum is σ = 5194332. Its totient is φ = 5180512.

The previous prime is 5187401. The next prime is 5187449. The reversal of 5187421 is 1247815.

5187421 = 1610² + 1611².

5187421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1247815 = 5 ⋅249563.

It can be written as a sum of positive squares in 2 ways, for example, as 2592100 + 2595321 = 1610^2 + 1611^2 .

It is a cyclic number.

It is not a de Polignac number, because 5187421 - 2⁷ = 5187293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5187421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5187401) 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, 2170 + ... + 3883.

It is an arithmetic number, because the mean of its divisors is an integer number (1298583).

Almost surely, 2^5187421 is an apocalyptic number.

5187421 is the 1611-st centered square number.

It is an amenable number.

5187421 is a deficient number, since it is larger than the sum of its proper divisors (6911).

5187421 is an equidigital number, since it uses as much as digits as its factorization.

5187421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6910.

The product of its digits is 2240, while the sum is 28.

The square root of 5187421 is about 2277.5910519670. The cubic root of 5187421 is about 173.1080105577.

The spelling of 5187421 in words is "five million, one hundred eighty-seven thousand, four hundred twenty-one".