81049713 has 8 divisors (see below), whose sum is σ = 108112800. Its totient is φ = 54009888.

The previous prime is 81049691. The next prime is 81049729. The reversal of 81049713 is 31794018.

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

It is not a de Polignac number, because 81049713 - 2⁵ = 81049681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81049733) 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, 5418 + ... + 13836.

It is an arithmetic number, because the mean of its divisors is an integer number (13514100).

Almost surely, 2^81049713 is an apocalyptic number.

It is an amenable number.

81049713 is a deficient number, since it is larger than the sum of its proper divisors (27063087).

81049713 is a wasteful number, since it uses less digits than its factorization.

81049713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11631.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81049713 is about 9002.7614097009. The cubic root of 81049713 is about 432.7633697216.

The spelling of 81049713 in words is "eighty-one million, forty-nine thousand, seven hundred thirteen".