899220173 has 2 divisors, whose sum is σ = 899220174. Its totient is φ = 899220172.

The previous prime is 899220143. The next prime is 899220191. The reversal of 899220173 is 371022998.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 899220169 + 4 = 29987^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 899220173 - 2¹⁶ = 899154637 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 899220173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (899220143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 449610086 + 449610087.

It is an arithmetic number, because the mean of its divisors is an integer number (449610087).

Almost surely, 2^899220173 is an apocalyptic number.

It is an amenable number.

899220173 is a deficient number, since it is larger than the sum of its proper divisors (1).

899220173 is an equidigital number, since it uses as much as digits as its factorization.

899220173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 899220173 is about 29987.0000666956. Note that the first 4 decimals coincide. The cubic root of 899220173 is about 965.2104467332.

The spelling of 899220173 in words is "eight hundred ninety-nine million, two hundred twenty thousand, one hundred seventy-three".