189631121 has 2 divisors, whose sum is σ = 189631122. Its totient is φ = 189631120.

The previous prime is 189631097. The next prime is 189631129. The reversal of 189631121 is 121136981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136632721 + 52998400 = 11689^2 + 7280^2 .

It is a cyclic number.

It is not a de Polignac number, because 189631121 - 2¹⁰ = 189630097 is a prime.

It is not a weakly prime, because it can be changed into another prime (189631129) 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, 94815560 + 94815561.

It is an arithmetic number, because the mean of its divisors is an integer number (94815561).

Almost surely, 2^189631121 is an apocalyptic number.

It is an amenable number.

189631121 is a deficient number, since it is larger than the sum of its proper divisors (1).

189631121 is an equidigital number, since it uses as much as digits as its factorization.

189631121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 189631121 is about 13770.6616035687. The cubic root of 189631121 is about 574.5174234598.

The spelling of 189631121 in words is "one hundred eighty-nine million, six hundred thirty-one thousand, one hundred twenty-one".