189996971 has 2 divisors, whose sum is σ = 189996972. Its totient is φ = 189996970.

The previous prime is 189996959. The next prime is 189996973. The reversal of 189996971 is 179699981.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 189996971 - 2¹⁰ = 189995947 is a prime.

Together with 189996973, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 189996971.

It is not a weakly prime, because it can be changed into another prime (189996973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94998485 + 94998486.

It is an arithmetic number, because the mean of its divisors is an integer number (94998486).

Almost surely, 2^189996971 is an apocalyptic number.

189996971 is a deficient number, since it is larger than the sum of its proper divisors (1).

189996971 is an equidigital number, since it uses as much as digits as its factorization.

189996971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2204496, while the sum is 59.

The square root of 189996971 is about 13783.9388782742. The cubic root of 189996971 is about 574.8866528942.

The spelling of 189996971 in words is "one hundred eighty-nine million, nine hundred ninety-six thousand, nine hundred seventy-one".