1531540313 has 2 divisors, whose sum is σ = 1531540314. Its totient is φ = 1531540312.

The previous prime is 1531540303. The next prime is 1531540343. The reversal of 1531540313 is 3130451351.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1527011929 + 4528384 = 39077^2 + 2128^2 .

It is a cyclic number.

It is not a de Polignac number, because 1531540313 - 2¹⁸ = 1531278169 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1531540303) 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, 765770156 + 765770157.

It is an arithmetic number, because the mean of its divisors is an integer number (765770157).

Almost surely, 2^1531540313 is an apocalyptic number.

It is an amenable number.

1531540313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531540313 is an equidigital number, since it uses as much as digits as its factorization.

1531540313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 1531540313 is about 39134.8989138850. The cubic root of 1531540313 is about 1152.6819102942.

Adding to 1531540313 its reverse (3130451351), we get a palindrome (4661991664).

The spelling of 1531540313 in words is "one billion, five hundred thirty-one million, five hundred forty thousand, three hundred thirteen".