989951173 has 2 divisors, whose sum is σ = 989951174. Its totient is φ = 989951172.

The previous prime is 989951113. The next prime is 989951219. The reversal of 989951173 is 371159989.

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., 852756804 + 137194369 = 29202^2 + 11713^2 .

It is a cyclic number.

It is not a de Polignac number, because 989951173 - 2¹³ = 989942981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989951173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989951113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494975586 + 494975587.

It is an arithmetic number, because the mean of its divisors is an integer number (494975587).

Almost surely, 2^989951173 is an apocalyptic number.

It is an amenable number.

989951173 is a deficient number, since it is larger than the sum of its proper divisors (1).

989951173 is an equidigital number, since it uses as much as digits as its factorization.

989951173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 52.

The square root of 989951173 is about 31463.4895235732. The cubic root of 989951173 is about 996.6391080598.

The spelling of 989951173 in words is "nine hundred eighty-nine million, nine hundred fifty-one thousand, one hundred seventy-three".