1231301329 has 2 divisors, whose sum is σ = 1231301330. Its totient is φ = 1231301328.

The previous prime is 1231301303. The next prime is 1231301359. The reversal of 1231301329 is 9231031321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1192113729 + 39187600 = 34527^2 + 6260^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231301329 - 2¹³ = 1231293137 is a prime.

It is a super-2 number, since 2×1231301329² = 3032205925594332482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1231301359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615650664 + 615650665.

It is an arithmetic number, because the mean of its divisors is an integer number (615650665).

Almost surely, 2^1231301329 is an apocalyptic number.

It is an amenable number.

1231301329 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231301329 is an equidigital number, since it uses as much as digits as its factorization.

1231301329 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 25.

The square root of 1231301329 is about 35089.9035193886. The cubic root of 1231301329 is about 1071.8189949392.

The spelling of 1231301329 in words is "one billion, two hundred thirty-one million, three hundred one thousand, three hundred twenty-nine".