23640691 has 2 divisors, whose sum is σ = 23640692. Its totient is φ = 23640690.

The previous prime is 23640689. The next prime is 23640737. The reversal of 23640691 is 19604632.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23640691 - 2¹ = 23640689 is a prime.

Together with 23640689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23640791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11820345 + 11820346.

It is an arithmetic number, because the mean of its divisors is an integer number (11820346).

Almost surely, 2^23640691 is an apocalyptic number.

23640691 is a deficient number, since it is larger than the sum of its proper divisors (1).

23640691 is an equidigital number, since it uses as much as digits as its factorization.

23640691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 23640691 is about 4862.1693717928. The cubic root of 23640691 is about 287.0031888665.

The spelling of 23640691 in words is "twenty-three million, six hundred forty thousand, six hundred ninety-one".