81127849 has 8 divisors (see below), whose sum is σ = 88584480. Its totient is φ = 73684800.

The previous prime is 81127817. The next prime is 81127867. The reversal of 81127849 is 94872118.

It is a happy number.

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 81127849 - 2⁵ = 81127817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81127649) 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, 12262 + ... + 17680.

It is an arithmetic number, because the mean of its divisors is an integer number (11073060).

Almost surely, 2^81127849 is an apocalyptic number.

It is an amenable number.

81127849 is a deficient number, since it is larger than the sum of its proper divisors (7456631).

81127849 is a wasteful number, since it uses less digits than its factorization.

81127849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6791.

The product of its digits is 32256, while the sum is 40.

The square root of 81127849 is about 9007.0999217284. The cubic root of 81127849 is about 432.9023936077.

The spelling of 81127849 in words is "eighty-one million, one hundred twenty-seven thousand, eight hundred forty-nine".