212225861 has 2 divisors, whose sum is σ = 212225862. Its totient is φ = 212225860.

The previous prime is 212225843. The next prime is 212225869. The reversal of 212225861 is 168522212.

212225861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157377025 + 54848836 = 12545^2 + 7406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212225861 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (212225869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106112930 + 106112931.

It is an arithmetic number, because the mean of its divisors is an integer number (106112931).

Almost surely, 2^212225861 is an apocalyptic number.

It is an amenable number.

212225861 is a deficient number, since it is larger than the sum of its proper divisors (1).

212225861 is an equidigital number, since it uses as much as digits as its factorization.

212225861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 29.

The square root of 212225861 is about 14567.9738124421. The cubic root of 212225861 is about 596.4848735445.

The spelling of 212225861 in words is "two hundred twelve million, two hundred twenty-five thousand, eight hundred sixty-one".