123201817 has 2 divisors, whose sum is σ = 123201818. Its totient is φ = 123201816.

The previous prime is 123201809. The next prime is 123201821. The reversal of 123201817 is 718102321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71419401 + 51782416 = 8451^2 + 7196^2 .

It is a cyclic number.

It is not a de Polignac number, because 123201817 - 2³ = 123201809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123201791 and 123201800.

It is not a weakly prime, because it can be changed into another prime (123201857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61600908 + 61600909.

It is an arithmetic number, because the mean of its divisors is an integer number (61600909).

Almost surely, 2^123201817 is an apocalyptic number.

It is an amenable number.

123201817 is a deficient number, since it is larger than the sum of its proper divisors (1).

123201817 is an equidigital number, since it uses as much as digits as its factorization.

123201817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 123201817 is about 11099.6313902760. The cubic root of 123201817 is about 497.5908331408.

The spelling of 123201817 in words is "one hundred twenty-three million, two hundred one thousand, eight hundred seventeen".