2531540309 has 2 divisors, whose sum is σ = 2531540310. Its totient is φ = 2531540308.

The previous prime is 2531540303. The next prime is 2531540357. The reversal of 2531540309 is 9030451352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1779574225 + 751966084 = 42185^2 + 27422^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531540309 - 2¹² = 2531536213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2531540303) 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 as a sum of consecutive naturals, namely, 1265770154 + 1265770155.

It is an arithmetic number, because the mean of its divisors is an integer number (1265770155).

Almost surely, 2^2531540309 is an apocalyptic number.

It is an amenable number.

2531540309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2531540309 is an equidigital number, since it uses as much as digits as its factorization.

2531540309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 2531540309 is about 50314.4145250643. The cubic root of 2531540309 is about 1362.8925440114.

The spelling of 2531540309 in words is "two billion, five hundred thirty-one million, five hundred forty thousand, three hundred nine".