5278421 has 2 divisors, whose sum is σ = 5278422. Its totient is φ = 5278420.

The previous prime is 5278397. The next prime is 5278423. The reversal of 5278421 is 1248725.

5278421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2686321 + 2592100 = 1639^2 + 1610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5278421 is a prime.

Together with 5278423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5278423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2639210 + 2639211.

It is an arithmetic number, because the mean of its divisors is an integer number (2639211).

Almost surely, 2^5278421 is an apocalyptic number.

It is an amenable number.

5278421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5278421 is an equidigital number, since it uses as much as digits as its factorization.

5278421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4480, while the sum is 29.

The square root of 5278421 is about 2297.4814471503. The cubic root of 5278421 is about 174.1143938833.

The spelling of 5278421 in words is "five million, two hundred seventy-eight thousand, four hundred twenty-one".