2731871609545 has 16 divisors (see below), whose sum is σ = 3530555944272. Its totient is φ = 2017303683840.

The previous prime is 2731871609539. The next prime is 2731871609573. The reversal of 2731871609545 is 5459061781372.

It can be written as a sum of positive squares in 8 ways, for example, as 48395160121 + 2683476449424 = 219989^2 + 1638132^2 .

It is not a de Polignac number, because 2731871609545 - 2³⁵ = 2697511871177 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2731871609545.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 895279 + ... + 2503051.

It is an arithmetic number, because the mean of its divisors is an integer number (220659746517).

It is a 1-persistent number, because it is pandigital, but 2⋅2731871609545 = 5463743219090 is not.

Almost surely, 2^{2731871609545} is an apocalyptic number.

It is an amenable number.

2731871609545 is a deficient number, since it is larger than the sum of its proper divisors (798684334727).

2731871609545 is a wasteful number, since it uses less digits than its factorization.

2731871609545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633932.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 2731871609545 in words is "two trillion, seven hundred thirty-one billion, eight hundred seventy-one million, six hundred nine thousand, five hundred forty-five".