23261521 has 2 divisors, whose sum is σ = 23261522. Its totient is φ = 23261520.

The previous prime is 23261467. The next prime is 23261531. The reversal of 23261521 is 12516232.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 746496 = 4745^2 + 864^2 .

It is a cyclic number.

It is not a de Polignac number, because 23261521 - 2¹¹ = 23259473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23261492 and 23261501.

It is not a weakly prime, because it can be changed into another prime (23261531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11630760 + 11630761.

It is an arithmetic number, because the mean of its divisors is an integer number (11630761).

Almost surely, 2^23261521 is an apocalyptic number.

It is an amenable number.

23261521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23261521 is an equidigital number, since it uses as much as digits as its factorization.

23261521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 23261521 is about 4823.0199045826. The cubic root of 23261521 is about 285.4605092175.

Adding to 23261521 its reverse (12516232), we get a palindrome (35777753).

The spelling of 23261521 in words is "twenty-three million, two hundred sixty-one thousand, five hundred twenty-one".