455136721 has 4 divisors (see below), whose sum is σ = 490147252. Its totient is φ = 420126192.

The previous prime is 455136713. The next prime is 455136727. The reversal of 455136721 is 127631554.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 192210496 + 262926225 = 13864^2 + 16215^2 .

It is a cyclic number.

It is not a de Polignac number, because 455136721 - 2³ = 455136713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (455136727) 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, 17505246 + ... + 17505271.

It is an arithmetic number, because the mean of its divisors is an integer number (122536813).

Almost surely, 2^455136721 is an apocalyptic number.

It is an amenable number.

455136721 is a deficient number, since it is larger than the sum of its proper divisors (35010531).

455136721 is a wasteful number, since it uses less digits than its factorization.

455136721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35010530.

The product of its digits is 25200, while the sum is 34.

The square root of 455136721 is about 21333.9335566604. The cubic root of 455136721 is about 769.2141986269.

The spelling of 455136721 in words is "four hundred fifty-five million, one hundred thirty-six thousand, seven hundred twenty-one".