555225421 has 4 divisors (see below), whose sum is σ = 555349500. Its totient is φ = 555101344.

The previous prime is 555225413. The next prime is 555225431. The reversal of 555225421 is 124522555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124522555 = 5 ⋅24904511.

It can be written as a sum of positive squares in 2 ways, for example, as 375933321 + 179292100 = 19389^2 + 13390^2 .

It is a cyclic number.

It is not a de Polignac number, because 555225421 - 2³ = 555225413 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 (555225431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55066 + ... + 64363.

It is an arithmetic number, because the mean of its divisors is an integer number (138837375).

Almost surely, 2^555225421 is an apocalyptic number.

It is an amenable number.

555225421 is a deficient number, since it is larger than the sum of its proper divisors (124079).

555225421 is a wasteful number, since it uses less digits than its factorization.

555225421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124078.

The product of its digits is 20000, while the sum is 31.

The square root of 555225421 is about 23563.2217873533. The cubic root of 555225421 is about 821.9078228127.

Adding to 555225421 its reverse (124522555), we get a palindrome (679747976).

The spelling of 555225421 in words is "five hundred fifty-five million, two hundred twenty-five thousand, four hundred twenty-one".