123632209 has 2 divisors, whose sum is σ = 123632210. Its totient is φ = 123632208.

The previous prime is 123632149. The next prime is 123632233. The reversal of 123632209 is 902236321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94633984 + 28998225 = 9728^2 + 5385^2 .

It is a cyclic number.

It is not a de Polignac number, because 123632209 - 2¹⁷ = 123501137 is a prime.

It is equal to p_7036651 and since 123632209 and 7036651 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (123636209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61816104 + 61816105.

It is an arithmetic number, because the mean of its divisors is an integer number (61816105).

Almost surely, 2^123632209 is an apocalyptic number.

It is an amenable number.

123632209 is a deficient number, since it is larger than the sum of its proper divisors (1).

123632209 is an equidigital number, since it uses as much as digits as its factorization.

123632209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 123632209 is about 11119.0021584673. The cubic root of 123632209 is about 498.1695860128.

The spelling of 123632209 in words is "one hundred twenty-three million, six hundred thirty-two thousand, two hundred nine".