2731557231005 has 4 divisors (see below), whose sum is σ = 3277868677212. Its totient is φ = 2185245784800.

The previous prime is 2731557231001. The next prime is 2731557231041. The reversal of 2731557231005 is 5001327551372.

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 735321685081 + 1996235545924 = 857509^2 + 1412882^2 .

It is not a de Polignac number, because 2731557231005 - 2² = 2731557231001 is a prime.

It is a super-2 number, since 2×2731557231005² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2731557231001) 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, 273155723096 + ... + 273155723105.

It is an arithmetic number, because the mean of its divisors is an integer number (819467169303).

Almost surely, 2^{2731557231005} is an apocalyptic number.

It is an amenable number.

2731557231005 is a deficient number, since it is larger than the sum of its proper divisors (546311446207).

2731557231005 is an equidigital number, since it uses as much as digits as its factorization.

2731557231005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546311446206.

The product of its (nonzero) digits is 220500, while the sum is 41.

The spelling of 2731557231005 in words is "two trillion, seven hundred thirty-one billion, five hundred fifty-seven million, two hundred thirty-one thousand, five".