81775713 has 8 divisors (see below), whose sum is σ = 110053728. Its totient is φ = 54007424.

The previous prime is 81775699. The next prime is 81775739. The reversal of 81775713 is 31757718.

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 81775713 - 2⁹ = 81775201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81775783) 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, 127056 + ... + 127697.

It is an arithmetic number, because the mean of its divisors is an integer number (13756716).

Almost surely, 2^81775713 is an apocalyptic number.

It is an amenable number.

81775713 is a deficient number, since it is larger than the sum of its proper divisors (28278015).

81775713 is a wasteful number, since it uses less digits than its factorization.

81775713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254863.

The product of its digits is 41160, while the sum is 39.

The square root of 81775713 is about 9042.9924803684. The cubic root of 81775713 is about 434.0516849685.

The spelling of 81775713 in words is "eighty-one million, seven hundred seventy-five thousand, seven hundred thirteen".