23835509 has 2 divisors, whose sum is σ = 23835510. Its totient is φ = 23835508.

The previous prime is 23835503. The next prime is 23835517. The reversal of 23835509 is 90553832.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20052484 + 3783025 = 4478^2 + 1945^2 .

It is a cyclic number.

It is not a de Polignac number, because 23835509 - 2¹² = 23831413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23835503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11917754 + 11917755.

It is an arithmetic number, because the mean of its divisors is an integer number (11917755).

Almost surely, 2^23835509 is an apocalyptic number.

It is an amenable number.

23835509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23835509 is an equidigital number, since it uses as much as digits as its factorization.

23835509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 23835509 is about 4882.1623283131. The cubic root of 23835509 is about 287.7894108992.

The spelling of 23835509 in words is "twenty-three million, eight hundred thirty-five thousand, five hundred nine".