2551521213 has 6 divisors (see below), whose sum is σ = 3685530654. Its totient is φ = 1701014136.

The previous prime is 2551521199. The next prime is 2551521227. The reversal of 2551521213 is 3121251552.

2551521213 is a `hidden beast` number, since 25 + 515 + 2 + 121 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (2551521199) and next prime (2551521227).

It can be written as a sum of positive squares in only one way, i.e., 1737389124 + 814132089 = 41682^2 + 28533^2 .

It is not a de Polignac number, because 2551521213 - 2⁶ = 2551521149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551521233) 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 5 ways as a sum of consecutive naturals, for example, 141751170 + ... + 141751187.

It is an arithmetic number, because the mean of its divisors is an integer number (614255109).

Almost surely, 2^2551521213 is an apocalyptic number.

It is an amenable number.

2551521213 is a deficient number, since it is larger than the sum of its proper divisors (1134009441).

2551521213 is a wasteful number, since it uses less digits than its factorization.

2551521213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283502363 (or 283502360 counting only the distinct ones).

The product of its digits is 3000, while the sum is 27.

The square root of 2551521213 is about 50512.5846992608. The cubic root of 2551521213 is about 1366.4688242331.

Adding to 2551521213 its reverse (3121251552), we get a palindrome (5672772765).

The spelling of 2551521213 in words is "two billion, five hundred fifty-one million, five hundred twenty-one thousand, two hundred thirteen".