123212861 has 2 divisors, whose sum is σ = 123212862. Its totient is φ = 123212860.

The previous prime is 123212857. The next prime is 123212893. The reversal of 123212861 is 168212321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112487236 + 10725625 = 10606^2 + 3275^2 .

It is an emirp because it is prime and its reverse (168212321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123212861 - 2² = 123212857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123212861.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123212801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61606430 + 61606431.

It is an arithmetic number, because the mean of its divisors is an integer number (61606431).

Almost surely, 2^123212861 is an apocalyptic number.

It is an amenable number.

123212861 is a deficient number, since it is larger than the sum of its proper divisors (1).

123212861 is an equidigital number, since it uses as much as digits as its factorization.

123212861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 26.

The square root of 123212861 is about 11100.1288731258. The cubic root of 123212861 is about 497.6057009652.

The spelling of 123212861 in words is "one hundred twenty-three million, two hundred twelve thousand, eight hundred sixty-one".