81126535 has 16 divisors (see below), whose sum is σ = 114849792. Its totient is φ = 53834400.

The previous prime is 81126491. The next prime is 81126541. The reversal of 81126535 is 53562118.

It is not a de Polignac number, because 81126535 - 2¹³ = 81118343 is a prime.

It is a super-2 number, since 2×81126535² = 13163029362212450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 81126497 and 81126506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36301 + ... + 38470.

It is an arithmetic number, because the mean of its divisors is an integer number (7178112).

Almost surely, 2^81126535 is an apocalyptic number.

81126535 is a deficient number, since it is larger than the sum of its proper divisors (33723257).

81126535 is a wasteful number, since it uses less digits than its factorization.

81126535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74814.

The product of its digits is 7200, while the sum is 31.

The square root of 81126535 is about 9007.0269789759. The cubic root of 81126535 is about 432.9000564045.

The spelling of 81126535 in words is "eighty-one million, one hundred twenty-six thousand, five hundred thirty-five".