23181001 has 2 divisors, whose sum is σ = 23181002. Its totient is φ = 23181000.

The previous prime is 23180959. The next prime is 23181017. The reversal of 23181001 is 10018132.

It is an a-pointer prime, because the next prime (23181017) can be obtained adding 23181001 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22099401 + 1081600 = 4701^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 23181001 - 2⁷ = 23180873 is a prime.

It is not a weakly prime, because it can be changed into another prime (23181071) 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, 11590500 + 11590501.

It is an arithmetic number, because the mean of its divisors is an integer number (11590501).

Almost surely, 2^23181001 is an apocalyptic number.

It is an amenable number.

23181001 is a deficient number, since it is larger than the sum of its proper divisors (1).

23181001 is an equidigital number, since it uses as much as digits as its factorization.

23181001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 23181001 is about 4814.6652012367. The cubic root of 23181001 is about 285.1307535868.

Adding to 23181001 its reverse (10018132), we get a palindrome (33199133).

The spelling of 23181001 in words is "twenty-three million, one hundred eighty-one thousand, one".