2551015405 has 4 divisors (see below), whose sum is σ = 3061218492. Its totient is φ = 2040812320.

The previous prime is 2551015403. The next prime is 2551015429. The reversal of 2551015405 is 5045101552.

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 472932009 + 2078083396 = 21747^2 + 45586^2 .

It is not a de Polignac number, because 2551015405 - 2¹ = 2551015403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551015403) 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 3 ways as a sum of consecutive naturals, for example, 255101536 + ... + 255101545.

It is an arithmetic number, because the mean of its divisors is an integer number (765304623).

Almost surely, 2^2551015405 is an apocalyptic number.

It is an amenable number.

2551015405 is a deficient number, since it is larger than the sum of its proper divisors (510203087).

2551015405 is an equidigital number, since it uses as much as digits as its factorization.

2551015405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510203086.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 2551015405 is about 50507.5776987968. The cubic root of 2551015405 is about 1366.3785229994.

Adding to 2551015405 its reverse (5045101552), we get a palindrome (7596116957).

The spelling of 2551015405 in words is "two billion, five hundred fifty-one million, fifteen thousand, four hundred five".