189735971 has 2 divisors, whose sum is σ = 189735972. Its totient is φ = 189735970.

The previous prime is 189735967. The next prime is 189735983. The reversal of 189735971 is 179537981.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 189735971 - 2² = 189735967 is a prime.

It is not a weakly prime, because it can be changed into another prime (189725971) 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, 94867985 + 94867986.

It is an arithmetic number, because the mean of its divisors is an integer number (94867986).

Almost surely, 2^189735971 is an apocalyptic number.

189735971 is a deficient number, since it is larger than the sum of its proper divisors (1).

189735971 is an equidigital number, since it uses as much as digits as its factorization.

189735971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 476280, while the sum is 50.

The square root of 189735971 is about 13774.4680841040. The cubic root of 189735971 is about 574.6232904939.

The spelling of 189735971 in words is "one hundred eighty-nine million, seven hundred thirty-five thousand, nine hundred seventy-one".