73121189 has 2 divisors, whose sum is σ = 73121190. Its totient is φ = 73121188.

The previous prime is 73121183. The next prime is 73121197. The reversal of 73121189 is 98112137.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65044225 + 8076964 = 8065^2 + 2842^2 .

It is a cyclic number.

It is not a de Polignac number, because 73121189 - 2⁴ = 73121173 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73121183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36560594 + 36560595.

It is an arithmetic number, because the mean of its divisors is an integer number (36560595).

Almost surely, 2^73121189 is an apocalyptic number.

It is an amenable number.

73121189 is a deficient number, since it is larger than the sum of its proper divisors (1).

73121189 is an equidigital number, since it uses as much as digits as its factorization.

73121189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 32.

The square root of 73121189 is about 8551.0928541327. The cubic root of 73121189 is about 418.1650657192.

It can be divided in two parts, 7312 and 1189, that multiplied together give a palindrome (8693968).

The spelling of 73121189 in words is "seventy-three million, one hundred twenty-one thousand, one hundred eighty-nine".