5157421 has 2 divisors, whose sum is σ = 5157422. Its totient is φ = 5157420.

The previous prime is 5157419. The next prime is 5157457. The reversal of 5157421 is 1247515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2788900 + 2368521 = 1670^2 + 1539^2 .

It is a cyclic number.

It is not a de Polignac number, because 5157421 - 2¹ = 5157419 is a prime.

Together with 5157419, it forms a pair of twin primes.

5157421 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5157491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2578710 + 2578711.

It is an arithmetic number, because the mean of its divisors is an integer number (2578711).

Almost surely, 2^5157421 is an apocalyptic number.

It is an amenable number.

5157421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5157421 is an equidigital number, since it uses as much as digits as its factorization.

5157421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 5157421 is about 2270.9955966492. The cubic root of 5157421 is about 172.7736579108.

The spelling of 5157421 in words is "five million, one hundred fifty-seven thousand, four hundred twenty-one".