171992923 has 2 divisors, whose sum is σ = 171992924. Its totient is φ = 171992922.

The previous prime is 171992917. The next prime is 171992941. The reversal of 171992923 is 329299171.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171992923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 171992923.

It is not a weakly prime, because it can be changed into another prime (171992993) 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, 85996461 + 85996462.

It is an arithmetic number, because the mean of its divisors is an integer number (85996462).

Almost surely, 2^171992923 is an apocalyptic number.

171992923 is a deficient number, since it is larger than the sum of its proper divisors (1).

171992923 is an equidigital number, since it uses as much as digits as its factorization.

171992923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 171992923 is about 13114.6072377330. The cubic root of 171992923 is about 556.1221491630.

The spelling of 171992923 in words is "one hundred seventy-one million, nine hundred ninety-two thousand, nine hundred twenty-three".