23649961 has 4 divisors (see below), whose sum is σ = 23670612. Its totient is φ = 23629312.

The previous prime is 23649959. The next prime is 23649991. The reversal of 23649961 is 16994632.

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 4596736 + 19053225 = 2144^2 + 4365^2 .

It is a cyclic number.

It is not a de Polignac number, because 23649961 - 2¹ = 23649959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23649991) 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, 8500 + ... + 10933.

It is an arithmetic number, because the mean of its divisors is an integer number (5917653).

Almost surely, 2^23649961 is an apocalyptic number.

It is an amenable number.

23649961 is a deficient number, since it is larger than the sum of its proper divisors (20651).

23649961 is a wasteful number, since it uses less digits than its factorization.

23649961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20650.

The product of its digits is 69984, while the sum is 40.

The square root of 23649961 is about 4863.1225565474. The cubic root of 23649961 is about 287.0406972441.

The spelling of 23649961 in words is "twenty-three million, six hundred forty-nine thousand, nine hundred sixty-one".