555554921 has 2 divisors, whose sum is σ = 555554922. Its totient is φ = 555554920.

The previous prime is 555554897. The next prime is 555554941. The reversal of 555554921 is 129455555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386554921 + 169000000 = 19661^2 + 13000^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-555554921 is a prime.

It is not a weakly prime, because it can be changed into another prime (555554941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 277777460 + 277777461.

It is an arithmetic number, because the mean of its divisors is an integer number (277777461).

Almost surely, 2^555554921 is an apocalyptic number.

It is an amenable number.

555554921 is a deficient number, since it is larger than the sum of its proper divisors (1).

555554921 is an equidigital number, since it uses as much as digits as its factorization.

555554921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225000, while the sum is 41.

The square root of 555554921 is about 23570.2125785916. The cubic root of 555554921 is about 822.0703784537.

The spelling of 555554921 in words is "five hundred fifty-five million, five hundred fifty-four thousand, nine hundred twenty-one".