122491189 has 2 divisors, whose sum is σ = 122491190. Its totient is φ = 122491188.

The previous prime is 122491183. The next prime is 122491217. The reversal of 122491189 is 981194221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69856164 + 52635025 = 8358^2 + 7255^2 .

It is a cyclic number.

It is not a de Polignac number, because 122491189 - 2¹¹ = 122489141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (122491183) 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, 61245594 + 61245595.

It is an arithmetic number, because the mean of its divisors is an integer number (61245595).

Almost surely, 2^122491189 is an apocalyptic number.

It is an amenable number.

122491189 is a deficient number, since it is larger than the sum of its proper divisors (1).

122491189 is an equidigital number, since it uses as much as digits as its factorization.

122491189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 122491189 is about 11067.5737630250. The cubic root of 122491189 is about 496.6322866062.

The spelling of 122491189 in words is "one hundred twenty-two million, four hundred ninety-one thousand, one hundred eighty-nine".