189266921 has 2 divisors, whose sum is σ = 189266922. Its totient is φ = 189266920.

The previous prime is 189266911. The next prime is 189266927. The reversal of 189266921 is 129662981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128504896 + 60762025 = 11336^2 + 7795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-189266921 is a prime.

It is not a weakly prime, because it can be changed into another prime (189266927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94633460 + 94633461.

It is an arithmetic number, because the mean of its divisors is an integer number (94633461).

Almost surely, 2^189266921 is an apocalyptic number.

It is an amenable number.

189266921 is a deficient number, since it is larger than the sum of its proper divisors (1).

189266921 is an equidigital number, since it uses as much as digits as its factorization.

189266921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 44.

The square root of 189266921 is about 13757.4314826569. The cubic root of 189266921 is about 574.1493872771.

The spelling of 189266921 in words is "one hundred eighty-nine million, two hundred sixty-six thousand, nine hundred twenty-one".