81752011 has 16 divisors (see below), whose sum is σ = 90574848. Its totient is φ = 73172800.

The previous prime is 81752009. The next prime is 81752029. The reversal of 81752011 is 11025718.

It is a cyclic number.

It is not a de Polignac number, because 81752011 - 2¹ = 81752009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81753011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350751 + ... + 350983.

It is an arithmetic number, because the mean of its divisors is an integer number (5660928).

Almost surely, 2^81752011 is an apocalyptic number.

81752011 is a deficient number, since it is larger than the sum of its proper divisors (8822837).

81752011 is a wasteful number, since it uses less digits than its factorization.

81752011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 81752011 is about 9041.6818678828. The cubic root of 81752011 is about 434.0097455109.

Adding to 81752011 its reverse (11025718), we get a palindrome (92777729).

The spelling of 81752011 in words is "eighty-one million, seven hundred fifty-two thousand, eleven".