23631661 has 2 divisors, whose sum is σ = 23631662. Its totient is φ = 23631660.

The previous prime is 23631659. The next prime is 23631689. The reversal of 23631661 is 16613632.

It is an a-pointer prime, because the next prime (23631689) can be obtained adding 23631661 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14212900 + 9418761 = 3770^2 + 3069^2 .

It is a cyclic number.

It is not a de Polignac number, because 23631661 - 2¹ = 23631659 is a prime.

Together with 23631659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23631631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11815830 + 11815831.

It is an arithmetic number, because the mean of its divisors is an integer number (11815831).

Almost surely, 2^23631661 is an apocalyptic number.

It is an amenable number.

23631661 is a deficient number, since it is larger than the sum of its proper divisors (1).

23631661 is an equidigital number, since it uses as much as digits as its factorization.

23631661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 23631661 is about 4861.2406852572. The cubic root of 23631661 is about 286.9666421508.

The spelling of 23631661 in words is "twenty-three million, six hundred thirty-one thousand, six hundred sixty-one".