1231323229 has 2 divisors, whose sum is σ = 1231323230. Its totient is φ = 1231323228.

The previous prime is 1231323199. The next prime is 1231323263. The reversal of 1231323229 is 9223231321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231308100 + 15129 = 35090^2 + 123^2 .

It is a cyclic number.

It is not a de Polignac number, because 1231323229 - 2¹⁵ = 1231290461 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231323197 and 1231323206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231320229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615661614 + 615661615.

It is an arithmetic number, because the mean of its divisors is an integer number (615661615).

Almost surely, 2^1231323229 is an apocalyptic number.

It is an amenable number.

1231323229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231323229 is an equidigital number, since it uses as much as digits as its factorization.

1231323229 is an evil number, because the sum of its binary digits is even.

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

The square root of 1231323229 is about 35090.2155735755. The cubic root of 1231323229 is about 1071.8253493807.

The spelling of 1231323229 in words is "one billion, two hundred thirty-one million, three hundred twenty-three thousand, two hundred twenty-nine".