99980173 has 2 divisors, whose sum is σ = 99980174. Its totient is φ = 99980172.

The previous prime is 99980171. The next prime is 99980189. The reversal of 99980173 is 37108999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98346889 + 1633284 = 9917^2 + 1278^2 .

It is a cyclic number.

It is not a de Polignac number, because 99980173 - 2¹ = 99980171 is a prime.

Together with 99980171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99980171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49990086 + 49990087.

It is an arithmetic number, because the mean of its divisors is an integer number (49990087).

Almost surely, 2^99980173 is an apocalyptic number.

It is an amenable number.

99980173 is a deficient number, since it is larger than the sum of its proper divisors (1).

99980173 is an equidigital number, since it uses as much as digits as its factorization.

99980173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 99980173 is about 9999.0086008564. The cubic root of 99980173 is about 464.1282050731.

The spelling of 99980173 in words is "ninety-nine million, nine hundred eighty thousand, one hundred seventy-three".