2551231405 has 4 divisors (see below), whose sum is σ = 3061477692. Its totient is φ = 2040985120.

The previous prime is 2551231367. The next prime is 2551231421. The reversal of 2551231405 is 5041321552.

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 680322889 + 1870908516 = 26083^2 + 43254^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2551231405 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255123136 + ... + 255123145.

It is an arithmetic number, because the mean of its divisors is an integer number (765369423).

Almost surely, 2^2551231405 is an apocalyptic number.

It is an amenable number.

2551231405 is a deficient number, since it is larger than the sum of its proper divisors (510246287).

2551231405 is an equidigital number, since it uses as much as digits as its factorization.

2551231405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510246286.

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

The square root of 2551231405 is about 50509.7159465384. The cubic root of 2551231405 is about 1366.4170866541.

Adding to 2551231405 its reverse (5041321552), we get a palindrome (7592552957).

The spelling of 2551231405 in words is "two billion, five hundred fifty-one million, two hundred thirty-one thousand, four hundred five".