81101077 has 8 divisors (see below), whose sum is σ = 84866616. Its totient is φ = 77418432.

The previous prime is 81101051. The next prime is 81101113. The reversal of 81101077 is 77010118.

It can be written as a sum of positive squares in 4 ways, for example, as 43573201 + 37527876 = 6601^2 + 6126^2 .

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 81101077 - 2¹⁹ = 80576789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81104077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18718 + ... + 22639.

It is an arithmetic number, because the mean of its divisors is an integer number (10608327).

Almost surely, 2^81101077 is an apocalyptic number.

It is an amenable number.

81101077 is a deficient number, since it is larger than the sum of its proper divisors (3765539).

81101077 is a wasteful number, since it uses less digits than its factorization.

81101077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41447.

The product of its (nonzero) digits is 392, while the sum is 25.

The square root of 81101077 is about 9005.6136381704. The cubic root of 81101077 is about 432.8547694437.

The spelling of 81101077 in words is "eighty-one million, one hundred one thousand, seventy-seven".