23209601509 has 4 divisors (see below), whose sum is σ = 24574872204. Its totient is φ = 21844330816.

The previous prime is 23209601497. The next prime is 23209601533. The reversal of 23209601509 is 90510690232.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14041539009 + 9168062500 = 118497^2 + 95750^2 .

It is a cyclic number.

It is not a de Polignac number, because 23209601509 - 2¹⁵ = 23209568741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23209661509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 682635322 + ... + 682635355.

It is an arithmetic number, because the mean of its divisors is an integer number (6143718051).

Almost surely, 2^23209601509 is an apocalyptic number.

It is an amenable number.

23209601509 is a deficient number, since it is larger than the sum of its proper divisors (1365270695).

23209601509 is a wasteful number, since it uses less digits than its factorization.

23209601509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1365270694.

The product of its (nonzero) digits is 29160, while the sum is 37.

The spelling of 23209601509 in words is "twenty-three billion, two hundred nine million, six hundred one thousand, five hundred nine".