171321923 has 2 divisors, whose sum is σ = 171321924. Its totient is φ = 171321922.

The previous prime is 171321911. The next prime is 171321929. The reversal of 171321923 is 329123171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171321923 - 2⁴ = 171321907 is a prime.

It is not a weakly prime, because it can be changed into another prime (171321929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85660961 + 85660962.

It is an arithmetic number, because the mean of its divisors is an integer number (85660962).

Almost surely, 2^171321923 is an apocalyptic number.

171321923 is a deficient number, since it is larger than the sum of its proper divisors (1).

171321923 is an equidigital number, since it uses as much as digits as its factorization.

171321923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2268, while the sum is 29.

The square root of 171321923 is about 13089.0000764000. Note that the first 4 decimals coincide. The cubic root of 171321923 is about 555.3980025333.

The spelling of 171321923 in words is "one hundred seventy-one million, three hundred twenty-one thousand, nine hundred twenty-three".