81168953 has 8 divisors (see below), whose sum is σ = 83721600. Its totient is φ = 78650800.

The previous prime is 81168929. The next prime is 81168961. The reversal of 81168953 is 35986118.

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

It is a cyclic number.

It is not a de Polignac number, because 81168953 - 2¹⁰ = 81167929 is a prime.

It is a super-2 number, since 2×81168953² = 13176797862232418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81168953.

It is not an unprimeable number, because it can be changed into a prime (81168653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3803 + ... + 13296.

It is an arithmetic number, because the mean of its divisors is an integer number (10465200).

Almost surely, 2^81168953 is an apocalyptic number.

It is an amenable number.

81168953 is a deficient number, since it is larger than the sum of its proper divisors (2552647).

81168953 is a wasteful number, since it uses less digits than its factorization.

81168953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17247.

The product of its digits is 51840, while the sum is 41.

The square root of 81168953 is about 9009.3813883085. The cubic root of 81168953 is about 432.9754922863.

The spelling of 81168953 in words is "eighty-one million, one hundred sixty-eight thousand, nine hundred fifty-three".