2731005261 has 32 divisors (see below), whose sum is σ = 4374012800. Its totient is φ = 1678216320.

The previous prime is 2731005247. The next prime is 2731005269. The reversal of 2731005261 is 1625001372.

It is a happy number.

It is not a de Polignac number, because 2731005261 - 2⁷ = 2731005133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2731005269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52960 + ... + 90921.

It is an arithmetic number, because the mean of its divisors is an integer number (136687900).

Almost surely, 2^2731005261 is an apocalyptic number.

It is an amenable number.

2731005261 is a deficient number, since it is larger than the sum of its proper divisors (1643007539).

2731005261 is a wasteful number, since it uses less digits than its factorization.

2731005261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143946 (or 143940 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 2731005261 is about 52259.0208576472. The cubic root of 2731005261 is about 1397.7865125566.

The spelling of 2731005261 in words is "two billion, seven hundred thirty-one million, five thousand, two hundred sixty-one".