81099163 has 8 divisors (see below), whose sum is σ = 90389520. Its totient is φ = 72311040.

The previous prime is 81099157. The next prime is 81099181. The reversal of 81099163 is 36199018.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81099163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81099103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125218 + ... + 125863.

It is an arithmetic number, because the mean of its divisors is an integer number (11298690).

Almost surely, 2^81099163 is an apocalyptic number.

81099163 is a deficient number, since it is larger than the sum of its proper divisors (9290357).

81099163 is a wasteful number, since it uses less digits than its factorization.

81099163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251117.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 81099163 is about 9005.5073704928. The cubic root of 81099163 is about 432.8513642667.

The spelling of 81099163 in words is "eighty-one million, ninety-nine thousand, one hundred sixty-three".