169989971 has 2 divisors, whose sum is σ = 169989972. Its totient is φ = 169989970.

The previous prime is 169989959. The next prime is 169989983. The reversal of 169989971 is 179989961.

169989971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (169989959) and next prime (169989983).

It is a cyclic number.

It is not a de Polignac number, because 169989971 - 2¹⁰ = 169988947 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 169989971.

It is not a weakly prime, because it can be changed into another prime (169989931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84994985 + 84994986.

It is an arithmetic number, because the mean of its divisors is an integer number (84994986).

Almost surely, 2^169989971 is an apocalyptic number.

169989971 is a deficient number, since it is larger than the sum of its proper divisors (1).

169989971 is an equidigital number, since it uses as much as digits as its factorization.

169989971 is an evil number, because the sum of its binary digits is even.

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

The square root of 169989971 is about 13038.0202101393. The cubic root of 169989971 is about 553.9549318862.

The spelling of 169989971 in words is "one hundred sixty-nine million, nine hundred eighty-nine thousand, nine hundred seventy-one".