612121189 has 2 divisors, whose sum is σ = 612121190. Its totient is φ = 612121188.

The previous prime is 612121141. The next prime is 612121201. The reversal of 612121189 is 981121216.

It is a happy number.

612121189 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., 426752964 + 185368225 = 20658^2 + 13615^2 .

It is a cyclic number.

It is not a de Polignac number, because 612121189 - 2¹¹ = 612119141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 612121189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (612121129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306060594 + 306060595.

It is an arithmetic number, because the mean of its divisors is an integer number (306060595).

Almost surely, 2^612121189 is an apocalyptic number.

It is an amenable number.

612121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

612121189 is an equidigital number, since it uses as much as digits as its factorization.

612121189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1728, while the sum is 31.

The square root of 612121189 is about 24741.0830199488. The cubic root of 612121189 is about 849.0745124098.

It can be divided in two parts, 612 and 121189, that added together give a square (121801 = 349²).

The spelling of 612121189 in words is "six hundred twelve million, one hundred twenty-one thousand, one hundred eighty-nine".