171742889 has 2 divisors, whose sum is σ = 171742890. Its totient is φ = 171742888.

The previous prime is 171742873. The next prime is 171742927. The reversal of 171742889 is 988247171.

It is a happy number.

171742889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86955625 + 84787264 = 9325^2 + 9208^2 .

It is a cyclic number.

It is not a de Polignac number, because 171742889 - 2⁴ = 171742873 is a prime.

It is not a weakly prime, because it can be changed into another prime (171742819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85871444 + 85871445.

It is an arithmetic number, because the mean of its divisors is an integer number (85871445).

Almost surely, 2^171742889 is an apocalyptic number.

It is an amenable number.

171742889 is a deficient number, since it is larger than the sum of its proper divisors (1).

171742889 is an equidigital number, since it uses as much as digits as its factorization.

171742889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 47.

The square root of 171742889 is about 13105.0711177010. The cubic root of 171742889 is about 555.8525317114.

The spelling of 171742889 in words is "one hundred seventy-one million, seven hundred forty-two thousand, eight hundred eighty-nine".