869729173 has 2 divisors, whose sum is σ = 869729174. Its totient is φ = 869729172.

The previous prime is 869729171. The next prime is 869729177. The reversal of 869729173 is 371927968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 442976209 + 426752964 = 21047^2 + 20658^2 .

869729173 is a truncatable prime.

It is a cyclic number.

It is not a de Polignac number, because 869729173 - 2¹ = 869729171 is a prime.

Together with 869729171, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 869729173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (869729171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434864586 + 434864587.

It is an arithmetic number, because the mean of its divisors is an integer number (434864587).

Almost surely, 2^869729173 is an apocalyptic number.

It is an amenable number.

869729173 is a deficient number, since it is larger than the sum of its proper divisors (1).

869729173 is an equidigital number, since it uses as much as digits as its factorization.

869729173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 869729173 is about 29491.1711025520. The cubic root of 869729173 is about 954.5412022797.

The spelling of 869729173 in words is "eight hundred sixty-nine million, seven hundred twenty-nine thousand, one hundred seventy-three".