455430721 has 4 divisors (see below), whose sum is σ = 461669572. Its totient is φ = 449191872.

The previous prime is 455430653. The next prime is 455430727. The reversal of 455430721 is 127034554.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 127034554 = 2 ⋅63517277.

It can be written as a sum of positive squares in 2 ways, for example, as 232227121 + 223203600 = 15239^2 + 14940^2 .

It is a cyclic number.

It is not a de Polignac number, because 455430721 - 2⁷ = 455430593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (455430727) 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, 3119316 + ... + 3119461.

It is an arithmetic number, because the mean of its divisors is an integer number (115417393).

Almost surely, 2^455430721 is an apocalyptic number.

It is an amenable number.

455430721 is a deficient number, since it is larger than the sum of its proper divisors (6238851).

455430721 is an equidigital number, since it uses as much as digits as its factorization.

455430721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6238850.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 455430721 is about 21340.8228754188. The cubic root of 455430721 is about 769.3797901126.

The spelling of 455430721 in words is "four hundred fifty-five million, four hundred thirty thousand, seven hundred twenty-one".