5515421 has 2 divisors, whose sum is σ = 5515422. Its totient is φ = 5515420.

The previous prime is 5515399. The next prime is 5515439. The reversal of 5515421 is 1245155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3189796 + 2325625 = 1786^2 + 1525^2 .

It is a cyclic number.

It is not a de Polignac number, because 5515421 - 2⁶ = 5515357 is a prime.

It is a super-3 number, since 3×5515421³ (a number of 21 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5515441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2757710 + 2757711.

It is an arithmetic number, because the mean of its divisors is an integer number (2757711).

Almost surely, 2^5515421 is an apocalyptic number.

It is an amenable number.

5515421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5515421 is an equidigital number, since it uses as much as digits as its factorization.

5515421 is an evil number, because the sum of its binary digits is even.

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

The square root of 5515421 is about 2348.4933468077. The cubic root of 5515421 is about 176.6822370676.

The spelling of 5515421 in words is "five million, five hundred fifteen thousand, four hundred twenty-one".