4518421 has 2 divisors, whose sum is σ = 4518422. Its totient is φ = 4518420.

The previous prime is 4518401. The next prime is 4518427. The reversal of 4518421 is 1248154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3900625 + 617796 = 1975^2 + 786^2 .

It is a cyclic number.

It is not a de Polignac number, because 4518421 - 2⁵ = 4518389 is a prime.

It is a super-3 number, since 3×4518421³ (a number of 21 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4518427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2259210 + 2259211.

It is an arithmetic number, because the mean of its divisors is an integer number (2259211).

Almost surely, 2^4518421 is an apocalyptic number.

It is an amenable number.

4518421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4518421 is an equidigital number, since it uses as much as digits as its factorization.

4518421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 25.

The square root of 4518421 is about 2125.6577805470. The cubic root of 4518421 is about 165.3213327911.

The spelling of 4518421 in words is "four million, five hundred eighteen thousand, four hundred twenty-one".