455720921 has 6 divisors (see below), whose sum is σ = 484105230. Its totient is φ = 428913536.

The previous prime is 455720911. The next prime is 455720939. The reversal of 455720921 is 129027554.

It can be written as a sum of positive squares in 3 ways, for example, as 216678400 + 239042521 = 14720^2 + 15461^2 .

It is not a de Polignac number, because 455720921 - 2¹⁰ = 455719897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (455720911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 788156 + ... + 788733.

It is an arithmetic number, because the mean of its divisors is an integer number (80684205).

Almost surely, 2^455720921 is an apocalyptic number.

It is an amenable number.

455720921 is a deficient number, since it is larger than the sum of its proper divisors (28384309).

455720921 is a wasteful number, since it uses less digits than its factorization.

455720921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576923 (or 1576906 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 455720921 is about 21347.6209681547. The cubic root of 455720921 is about 769.5431714263.

The spelling of 455720921 in words is "four hundred fifty-five million, seven hundred twenty thousand, nine hundred twenty-one".