189620897 has 2 divisors, whose sum is σ = 189620898. Its totient is φ = 189620896.

The previous prime is 189620863. The next prime is 189620917. The reversal of 189620897 is 798026981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103205281 + 86415616 = 10159^2 + 9296^2 .

It is a cyclic number.

It is not a de Polignac number, because 189620897 - 2⁶ = 189620833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189620857) 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, 94810448 + 94810449.

It is an arithmetic number, because the mean of its divisors is an integer number (94810449).

Almost surely, 2^189620897 is an apocalyptic number.

It is an amenable number.

189620897 is a deficient number, since it is larger than the sum of its proper divisors (1).

189620897 is an equidigital number, since it uses as much as digits as its factorization.

189620897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 189620897 is about 13770.2903745709. The cubic root of 189620897 is about 574.5070982001.

The spelling of 189620897 in words is "one hundred eighty-nine million, six hundred twenty thousand, eight hundred ninety-seven".