5651515221 has 16 divisors (see below), whose sum is σ = 8265811008. Its totient is φ = 3406233600.

The previous prime is 5651515169. The next prime is 5651515267. The reversal of 5651515221 is 1225151565.

It is not a de Polignac number, because 5651515221 - 2²⁶ = 5584406357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651515291) 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 15 ways as a sum of consecutive naturals, for example, 467116 + ... + 479061.

It is an arithmetic number, because the mean of its divisors is an integer number (516613188).

Almost surely, 2^5651515221 is an apocalyptic number.

It is an amenable number.

5651515221 is a deficient number, since it is larger than the sum of its proper divisors (2614295787).

5651515221 is a wasteful number, since it uses less digits than its factorization.

5651515221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946372.

The product of its digits is 15000, while the sum is 33.

The square root of 5651515221 is about 75176.5603163646. The cubic root of 5651515221 is about 1781.2366969668.

Adding to 5651515221 its reverse (1225151565), we get a palindrome (6876666786).

The spelling of 5651515221 in words is "five billion, six hundred fifty-one million, five hundred fifteen thousand, two hundred twenty-one".