123640211 has 2 divisors, whose sum is σ = 123640212. Its totient is φ = 123640210.

The previous prime is 123640147. The next prime is 123640217. The reversal of 123640211 is 112046321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123640211 - 2⁶ = 123640147 is a prime.

It is a super-2 number, since 2×123640211² = 30573803552249042, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (123640217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61820105 + 61820106.

It is an arithmetic number, because the mean of its divisors is an integer number (61820106).

Almost surely, 2^123640211 is an apocalyptic number.

123640211 is a deficient number, since it is larger than the sum of its proper divisors (1).

123640211 is an equidigital number, since it uses as much as digits as its factorization.

123640211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 123640211 is about 11119.3619870926. The cubic root of 123640211 is about 498.1803336625.

Adding to 123640211 its reverse (112046321), we get a palindrome (235686532).

The spelling of 123640211 in words is "one hundred twenty-three million, six hundred forty thousand, two hundred eleven".