81041434 has 4 divisors (see below), whose sum is σ = 121562154. Its totient is φ = 40520716.

The previous prime is 81041417. The next prime is 81041437. The reversal of 81041434 is 43414018.

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

It can be written as a sum of positive squares in only one way, i.e., 46854025 + 34187409 = 6845^2 + 5847^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81041399 and 81041408.

It is not an unprimeable number, because it can be changed into a prime (81041437) 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 as a sum of consecutive naturals, namely, 20260357 + ... + 20260360.

Almost surely, 2^81041434 is an apocalyptic number.

81041434 is a deficient number, since it is larger than the sum of its proper divisors (40520720).

81041434 is a wasteful number, since it uses less digits than its factorization.

81041434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40520719.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 81041434 is about 9002.3015945924. The cubic root of 81041434 is about 432.7486340332.

The spelling of 81041434 in words is "eighty-one million, forty-one thousand, four hundred thirty-four".