2551231145 has 4 divisors (see below), whose sum is σ = 3061477380. Its totient is φ = 2040984912.

The previous prime is 2551231129. The next prime is 2551231147. The reversal of 2551231145 is 5411321552.

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 1265865241 + 1285365904 = 35579^2 + 35852^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551231145 - 2⁴ = 2551231129 is a prime.

It is a super-2 number, since 2×2551231145² = 13017560710436022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2551231147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 255123110 + ... + 255123119.

It is an arithmetic number, because the mean of its divisors is an integer number (765369345).

Almost surely, 2^2551231145 is an apocalyptic number.

It is an amenable number.

2551231145 is a deficient number, since it is larger than the sum of its proper divisors (510246235).

2551231145 is an equidigital number, since it uses as much as digits as its factorization.

2551231145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510246234.

The product of its digits is 6000, while the sum is 29.

The square root of 2551231145 is about 50509.7133727761. The cubic root of 2551231145 is about 1366.4170402362.

Adding to 2551231145 its reverse (5411321552), we get a palindrome (7962552697).

The spelling of 2551231145 in words is "two billion, five hundred fifty-one million, two hundred thirty-one thousand, one hundred forty-five".