4551515021 has 4 divisors (see below), whose sum is σ = 4551685344. Its totient is φ = 4551344700.

The previous prime is 4551514987. The next prime is 4551515039. The reversal of 4551515021 is 1205151554.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4551515021 - 2¹⁸ = 4551252877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4551515051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35375 + ... + 101756.

It is an arithmetic number, because the mean of its divisors is an integer number (1137921336).

Almost surely, 2^4551515021 is an apocalyptic number.

It is an amenable number.

4551515021 is a deficient number, since it is larger than the sum of its proper divisors (170323).

4551515021 is a wasteful number, since it uses less digits than its factorization.

4551515021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170322.

The product of its (nonzero) digits is 5000, while the sum is 29.

The square root of 4551515021 is about 67464.9169643008. The cubic root of 4551515021 is about 1657.2396934674.

Adding to 4551515021 its reverse (1205151554), we get a palindrome (5756666575).

The spelling of 4551515021 in words is "four billion, five hundred fifty-one million, five hundred fifteen thousand, twenty-one".