4551721115 has 4 divisors (see below), whose sum is σ = 5462065344. Its totient is φ = 3641376888.

The previous prime is 4551721061. The next prime is 4551721147. The reversal of 4551721115 is 5111271554.

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

It is a cyclic number.

It is not a de Polignac number, because 4551721115 - 2²⁴ = 4534943899 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 455172107 + ... + 455172116.

It is an arithmetic number, because the mean of its divisors is an integer number (1365516336).

Almost surely, 2^4551721115 is an apocalyptic number.

4551721115 is a deficient number, since it is larger than the sum of its proper divisors (910344229).

4551721115 is an equidigital number, since it uses as much as digits as its factorization.

4551721115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 910344228.

The product of its digits is 7000, while the sum is 32.

The square root of 4551721115 is about 67466.4443631054. Note that the first 3 decimals coincide. The cubic root of 4551721115 is about 1657.2647065309.

Adding to 4551721115 its reverse (5111271554), we get a palindrome (9662992669).

The spelling of 4551721115 in words is "four billion, five hundred fifty-one million, seven hundred twenty-one thousand, one hundred fifteen".