81011835 has 24 divisors (see below), whose sum is σ = 144952704. Its totient is φ = 41811840.

The previous prime is 81011813. The next prime is 81011837. The reversal of 81011835 is 53811018.

It is not a de Polignac number, because 81011835 - 2⁵ = 81011803 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81011799 and 81011808.

It is not an unprimeable number, because it can be changed into a prime (81011837) 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 23 ways as a sum of consecutive naturals, for example, 27642 + ... + 30431.

It is an arithmetic number, because the mean of its divisors is an integer number (6039696).

Almost surely, 2^81011835 is an apocalyptic number.

81011835 is a deficient number, since it is larger than the sum of its proper divisors (63940869).

81011835 is a wasteful number, since it uses less digits than its factorization.

81011835 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58115 (or 58112 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 81011835 is about 9000.6574759847. The cubic root of 81011835 is about 432.6959429347.

The spelling of 81011835 in words is "eighty-one million, eleven thousand, eight hundred thirty-five".