2551516129 has 4 divisors (see below), whose sum is σ = 2562467076. Its totient is φ = 2540565184.

The previous prime is 2551516117. The next prime is 2551516133. The reversal of 2551516129 is 9216151552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1095941025 + 1455575104 = 33105^2 + 38152^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551516129 - 2⁷ = 2551516001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2551516159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5475124 + ... + 5475589.

It is an arithmetic number, because the mean of its divisors is an integer number (640616769).

Almost surely, 2^2551516129 is an apocalyptic number.

It is an amenable number.

2551516129 is a deficient number, since it is larger than the sum of its proper divisors (10950947).

2551516129 is a wasteful number, since it uses less digits than its factorization.

2551516129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10950946.

The product of its digits is 27000, while the sum is 37.

The square root of 2551516129 is about 50512.5343751430. The cubic root of 2551516129 is about 1366.4679166527.

The spelling of 2551516129 in words is "two billion, five hundred fifty-one million, five hundred sixteen thousand, one hundred twenty-nine".