1235423209 has 2 divisors, whose sum is σ = 1235423210. Its totient is φ = 1235423208.

The previous prime is 1235423197. The next prime is 1235423257. The reversal of 1235423209 is 9023245321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 761925609 + 473497600 = 27603^2 + 21760^2 .

It is a cyclic number.

It is not a de Polignac number, because 1235423209 - 2⁹ = 1235422697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1235423279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617711604 + 617711605.

It is an arithmetic number, because the mean of its divisors is an integer number (617711605).

Almost surely, 2^1235423209 is an apocalyptic number.

It is an amenable number.

1235423209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235423209 is an equidigital number, since it uses as much as digits as its factorization.

1235423209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 1235423209 is about 35148.5875818645. The cubic root of 1235423209 is about 1073.0136628769.

The spelling of 1235423209 in words is "one billion, two hundred thirty-five million, four hundred twenty-three thousand, two hundred nine".