2551401217 has 4 divisors (see below), whose sum is σ = 2551526100. Its totient is φ = 2551276336.

The previous prime is 2551401211. The next prime is 2551401221. The reversal of 2551401217 is 7121041552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1032272641 + 1519128576 = 32129^2 + 38976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551401217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551401211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23842 + ... + 75307.

It is an arithmetic number, because the mean of its divisors is an integer number (637881525).

Almost surely, 2^2551401217 is an apocalyptic number.

It is an amenable number.

2551401217 is a deficient number, since it is larger than the sum of its proper divisors (124883).

2551401217 is an equidigital number, since it uses as much as digits as its factorization.

2551401217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124882.

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 2551401217 is about 50511.3969020854. The cubic root of 2551401217 is about 1366.4474025857.

Adding to 2551401217 its reverse (7121041552), we get a palindrome (9672442769).

The spelling of 2551401217 in words is "two billion, five hundred fifty-one million, four hundred one thousand, two hundred seventeen".