423169909 has 2 divisors, whose sum is σ = 423169910. Its totient is φ = 423169908.

The previous prime is 423169907. The next prime is 423169927. The reversal of 423169909 is 909961324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 286794225 + 136375684 = 16935^2 + 11678^2 .

It is a cyclic number.

It is not a de Polignac number, because 423169909 - 2¹ = 423169907 is a prime.

Together with 423169907, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423169907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211584954 + 211584955.

It is an arithmetic number, because the mean of its divisors is an integer number (211584955).

Almost surely, 2^423169909 is an apocalyptic number.

It is an amenable number.

423169909 is a deficient number, since it is larger than the sum of its proper divisors (1).

423169909 is an equidigital number, since it uses as much as digits as its factorization.

423169909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 423169909 is about 20571.0940156327. The cubic root of 423169909 is about 750.7665697091.

It can be divided in two parts, 42316 and 9909, that added together give a palindrome (52225).

The spelling of 423169909 in words is "four hundred twenty-three million, one hundred sixty-nine thousand, nine hundred nine".