2631871345 has 4 divisors (see below), whose sum is σ = 3158245620. Its totient is φ = 2105497072.

The previous prime is 2631871339. The next prime is 2631871357. The reversal of 2631871345 is 5431781362.

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 1818937201 + 812934144 = 42649^2 + 28512^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631871345 - 2⁷ = 2631871217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2631871298 and 2631871307.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263187130 + ... + 263187139.

It is an arithmetic number, because the mean of its divisors is an integer number (789561405).

Almost surely, 2^2631871345 is an apocalyptic number.

It is an amenable number.

2631871345 is a deficient number, since it is larger than the sum of its proper divisors (526374275).

2631871345 is an equidigital number, since it uses as much as digits as its factorization.

2631871345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526374274.

The product of its digits is 120960, while the sum is 40.

The square root of 2631871345 is about 51301.7674646790. The cubic root of 2631871345 is about 1380.6646915202.

The spelling of 2631871345 in words is "two billion, six hundred thirty-one million, eight hundred seventy-one thousand, three hundred forty-five".