81119447 has 8 divisors (see below), whose sum is σ = 82598880. Its totient is φ = 79644960.

The previous prime is 81119431. The next prime is 81119449. The reversal of 81119447 is 74491118.

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 81119447 - 2⁴ = 81119431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81119449) 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, 51254 + ... + 52812.

It is an arithmetic number, because the mean of its divisors is an integer number (10324860).

Almost surely, 2^81119447 is an apocalyptic number.

81119447 is a deficient number, since it is larger than the sum of its proper divisors (1479433).

81119447 is a wasteful number, since it uses less digits than its factorization.

81119447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473.

The product of its digits is 8064, while the sum is 35.

The square root of 81119447 is about 9006.6334998156. The cubic root of 81119447 is about 432.8874485897.

The spelling of 81119447 in words is "eighty-one million, one hundred nineteen thousand, four hundred forty-seven".