23155217 has 2 divisors, whose sum is σ = 23155218. Its totient is φ = 23155216.

The previous prime is 23155213. The next prime is 23155247. The reversal of 23155217 is 71255132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14622976 + 8532241 = 3824^2 + 2921^2 .

It is a cyclic number.

It is not a de Polignac number, because 23155217 - 2² = 23155213 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23155213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11577608 + 11577609.

It is an arithmetic number, because the mean of its divisors is an integer number (11577609).

Almost surely, 2^23155217 is an apocalyptic number.

It is an amenable number.

23155217 is a deficient number, since it is larger than the sum of its proper divisors (1).

23155217 is an equidigital number, since it uses as much as digits as its factorization.

23155217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 26.

The square root of 23155217 is about 4811.9868038057. The cubic root of 23155217 is about 285.0249983202.

The spelling of 23155217 in words is "twenty-three million, one hundred fifty-five thousand, two hundred seventeen".