1531231343 has 2 divisors, whose sum is σ = 1531231344. Its totient is φ = 1531231342.

The previous prime is 1531231301. The next prime is 1531231357. The reversal of 1531231343 is 3431321351.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1531231343 - 2⁸ = 1531231087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1531231363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765615671 + 765615672.

It is an arithmetic number, because the mean of its divisors is an integer number (765615672).

Almost surely, 2^1531231343 is an apocalyptic number.

1531231343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531231343 is an equidigital number, since it uses as much as digits as its factorization.

1531231343 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 26.

The square root of 1531231343 is about 39130.9512151187. The cubic root of 1531231343 is about 1152.6043918032.

Adding to 1531231343 its reverse (3431321351), we get a palindrome (4962552694).

The spelling of 1531231343 in words is "one billion, five hundred thirty-one million, two hundred thirty-one thousand, three hundred forty-three".