23509019 has 2 divisors, whose sum is σ = 23509020. Its totient is φ = 23509018.

The previous prime is 23509007. The next prime is 23509033. The reversal of 23509019 is 91090532.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23509019 is a prime.

It is a super-2 number, since 2×23509019² = 1105347948684722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23508982 and 23509000.

It is not a weakly prime, because it can be changed into another prime (23509049) 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, 11754509 + 11754510.

It is an arithmetic number, because the mean of its divisors is an integer number (11754510).

Almost surely, 2^23509019 is an apocalyptic number.

23509019 is a deficient number, since it is larger than the sum of its proper divisors (1).

23509019 is an equidigital number, since it uses as much as digits as its factorization.

23509019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 23509019 is about 4848.6100070020. The cubic root of 23509019 is about 286.4693541857.

The spelling of 23509019 in words is "twenty-three million, five hundred nine thousand, nineteen".