555423921 has 24 divisors (see below), whose sum is σ = 893791080. Its totient is φ = 330011136.

The previous prime is 555423901. The next prime is 555423923. The reversal of 555423921 is 129324555.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 62583921 + 492840000 = 7911^2 + 22200^2 .

It is not a de Polignac number, because 555423921 - 2⁷ = 555423793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (555423923) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78456 + ... + 85241.

It is an arithmetic number, because the mean of its divisors is an integer number (37241295).

Almost surely, 2^555423921 is an apocalyptic number.

It is an amenable number.

555423921 is a deficient number, since it is larger than the sum of its proper divisors (338367159).

555423921 is a wasteful number, since it uses less digits than its factorization.

555423921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163745 (or 163742 counting only the distinct ones).

The product of its digits is 54000, while the sum is 36.

The square root of 555423921 is about 23567.4334835170. The cubic root of 555423921 is about 822.0057585687.

The spelling of 555423921 in words is "five hundred fifty-five million, four hundred twenty-three thousand, nine hundred twenty-one".