23621261 has 2 divisors, whose sum is σ = 23621262. Its totient is φ = 23621260.

The previous prime is 23621251. The next prime is 23621263. The reversal of 23621261 is 16212632.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23377225 + 244036 = 4835^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 23621261 - 2¹⁸ = 23359117 is a prime.

It is a Sophie Germain prime.

Together with 23621263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23621263) 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, 11810630 + 11810631.

It is an arithmetic number, because the mean of its divisors is an integer number (11810631).

Almost surely, 2^23621261 is an apocalyptic number.

It is an amenable number.

23621261 is a deficient number, since it is larger than the sum of its proper divisors (1).

23621261 is an equidigital number, since it uses as much as digits as its factorization.

23621261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 23621261 is about 4860.1708817695. The cubic root of 23621261 is about 286.9245391575.

Adding to 23621261 its reverse (16212632), we get a palindrome (39833893).

It can be divided in two parts, 2 and 3621261, that added together give a palindrome (3621263).

The spelling of 23621261 in words is "twenty-three million, six hundred twenty-one thousand, two hundred sixty-one".