81202173 has 8 divisors (see below), whose sum is σ = 116598048. Its totient is φ = 49970544.

The previous prime is 81202171. The next prime is 81202243. The reversal of 81202173 is 37120218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81202173 - 2¹ = 81202171 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81202171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1041015 + ... + 1041092.

It is an arithmetic number, because the mean of its divisors is an integer number (14574756).

Almost surely, 2^81202173 is an apocalyptic number.

It is an amenable number.

81202173 is a deficient number, since it is larger than the sum of its proper divisors (35395875).

81202173 is a wasteful number, since it uses less digits than its factorization.

81202173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082123.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 81202173 is about 9011.2248335063. The cubic root of 81202173 is about 433.0345521589.

The spelling of 81202173 in words is "eighty-one million, two hundred two thousand, one hundred seventy-three".