123115211 has 4 divisors (see below), whose sum is σ = 123245352. Its totient is φ = 122985072.

The previous prime is 123115171. The next prime is 123115271. The reversal of 123115211 is 112511321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123115211 - 2⁶ = 123115147 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123115211.

It is not an unprimeable number, because it can be changed into a prime (123115271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63641 + ... + 65546.

It is an arithmetic number, because the mean of its divisors is an integer number (30811338).

Almost surely, 2^123115211 is an apocalyptic number.

123115211 is a deficient number, since it is larger than the sum of its proper divisors (130141).

123115211 is an equidigital number, since it uses as much as digits as its factorization.

123115211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130140.

The product of its digits is 60, while the sum is 17.

The square root of 123115211 is about 11095.7294036940. The cubic root of 123115211 is about 497.4742102571.

Adding to 123115211 its reverse (112511321), we get a palindrome (235626532).

The spelling of 123115211 in words is "one hundred twenty-three million, one hundred fifteen thousand, two hundred eleven".