23217913 has 2 divisors, whose sum is σ = 23217914. Its totient is φ = 23217912.

The previous prime is 23217899. The next prime is 23217941. The reversal of 23217913 is 31971232.

It is an a-pointer prime, because the next prime (23217941) can be obtained adding 23217913 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., 21650409 + 1567504 = 4653^2 + 1252^2 .

It is a cyclic number.

It is not a de Polignac number, because 23217913 - 2¹⁷ = 23086841 is a prime.

It is not a weakly prime, because it can be changed into another prime (23217973) 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, 11608956 + 11608957.

It is an arithmetic number, because the mean of its divisors is an integer number (11608957).

Almost surely, 2^23217913 is an apocalyptic number.

It is an amenable number.

23217913 is a deficient number, since it is larger than the sum of its proper divisors (1).

23217913 is an equidigital number, since it uses as much as digits as its factorization.

23217913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 28.

The square root of 23217913 is about 4818.4969648221. The cubic root of 23217913 is about 285.2820148861.

It can be divided in two parts, 232 and 17913, that added together give a triangular number (18145 = T₁₉₀).

The spelling of 23217913 in words is "twenty-three million, two hundred seventeen thousand, nine hundred thirteen".