455555921 has 2 divisors, whose sum is σ = 455555922. Its totient is φ = 455555920.

The previous prime is 455555899. The next prime is 455555927. The reversal of 455555921 is 129555554.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 451987600 + 3568321 = 21260^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 455555921 - 2⁶ = 455555857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (455555927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 227777960 + 227777961.

It is an arithmetic number, because the mean of its divisors is an integer number (227777961).

Almost surely, 2^455555921 is an apocalyptic number.

It is an amenable number.

455555921 is a deficient number, since it is larger than the sum of its proper divisors (1).

455555921 is an equidigital number, since it uses as much as digits as its factorization.

455555921 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 455555921 is about 21343.7560190328. The cubic root of 455555921 is about 769.4502856675.

The spelling of 455555921 in words is "four hundred fifty-five million, five hundred fifty-five thousand, nine hundred twenty-one".