5155421 has 4 divisors (see below), whose sum is σ = 5160000. Its totient is φ = 5150844.

The previous prime is 5155387. The next prime is 5155433. The reversal of 5155421 is 1245515.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1245515 = 5 ⋅249103.

It is a cyclic number.

It is not a de Polignac number, because 5155421 - 2¹⁸ = 4893277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5155481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 710 + ... + 3288.

It is an arithmetic number, because the mean of its divisors is an integer number (1290000).

Almost surely, 2^5155421 is an apocalyptic number.

It is an amenable number.

5155421 is a deficient number, since it is larger than the sum of its proper divisors (4579).

5155421 is a wasteful number, since it uses less digits than its factorization.

5155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4578.

The product of its digits is 1000, while the sum is 23.

The square root of 5155421 is about 2270.5552184433. Note that the first 3 decimals coincide. The cubic root of 5155421 is about 172.7513216830.

The spelling of 5155421 in words is "five million, one hundred fifty-five thousand, four hundred twenty-one".