81126326 has 4 divisors (see below), whose sum is σ = 121689492. Its totient is φ = 40563162.

The previous prime is 81126307. The next prime is 81126341. The reversal of 81126326 is 62362118.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20281580 + ... + 20281583.

It is an arithmetic number, because the mean of its divisors is an integer number (30422373).

Almost surely, 2^81126326 is an apocalyptic number.

81126326 is a deficient number, since it is larger than the sum of its proper divisors (40563166).

81126326 is a wasteful number, since it uses less digits than its factorization.

81126326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40563165.

The product of its digits is 3456, while the sum is 29.

The square root of 81126326 is about 9007.0153769159. The cubic root of 81126326 is about 432.8996846552.

The spelling of 81126326 in words is "eighty-one million, one hundred twenty-six thousand, three hundred twenty-six".