2551523221 has 8 divisors (see below), whose sum is σ = 2748264344. Its totient is φ = 2354849280.

The previous prime is 2551523203. The next prime is 2551523257. The reversal of 2551523221 is 1223251552.

It can be written as a sum of positive squares in 4 ways, for example, as 433222596 + 2118300625 = 20814^2 + 46025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2551523221 - 2¹⁷ = 2551392149 is a prime.

It is a super-3 number, since 3×2551523221³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2551523221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551523291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84961 + ... + 111001.

It is an arithmetic number, because the mean of its divisors is an integer number (343533043).

Almost surely, 2^2551523221 is an apocalyptic number.

It is an amenable number.

2551523221 is a deficient number, since it is larger than the sum of its proper divisors (196741123).

2551523221 is a wasteful number, since it uses less digits than its factorization.

2551523221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33591.

The product of its digits is 6000, while the sum is 28.

The square root of 2551523221 is about 50512.6045754918. The cubic root of 2551523221 is about 1366.4691826949.

Adding to 2551523221 its reverse (1223251552), we get a palindrome (3774774773).

The spelling of 2551523221 in words is "two billion, five hundred fifty-one million, five hundred twenty-three thousand, two hundred twenty-one".