23313509 has 2 divisors, whose sum is σ = 23313510. Its totient is φ = 23313508.

The previous prime is 23313491. The next prime is 23313533. The reversal of 23313509 is 90531332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22591009 + 722500 = 4753^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 23313509 - 2¹² = 23309413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23313539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11656754 + 11656755.

It is an arithmetic number, because the mean of its divisors is an integer number (11656755).

Almost surely, 2^23313509 is an apocalyptic number.

It is an amenable number.

23313509 is a deficient number, since it is larger than the sum of its proper divisors (1).

23313509 is an equidigital number, since it uses as much as digits as its factorization.

23313509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 23313509 is about 4828.4064659057. The cubic root of 23313509 is about 285.6730129311.

The spelling of 23313509 in words is "twenty-three million, three hundred thirteen thousand, five hundred nine".