1232431309 has 2 divisors, whose sum is σ = 1232431310. Its totient is φ = 1232431308.

The previous prime is 1232431297. The next prime is 1232431339. The reversal of 1232431309 is 9031342321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 776736900 + 455694409 = 27870^2 + 21347^2 .

It is a cyclic number.

It is not a de Polignac number, because 1232431309 - 2¹³ = 1232423117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1232431339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 616215654 + 616215655.

It is an arithmetic number, because the mean of its divisors is an integer number (616215655).

Almost surely, 2^1232431309 is an apocalyptic number.

It is an amenable number.

1232431309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1232431309 is an equidigital number, since it uses as much as digits as its factorization.

1232431309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1232431309 is about 35106.0010397083. The cubic root of 1232431309 is about 1072.1467684087.

The spelling of 1232431309 in words is "one billion, two hundred thirty-two million, four hundred thirty-one thousand, three hundred nine".