81041435 has 4 divisors (see below), whose sum is σ = 97249728. Its totient is φ = 64833144.

The previous prime is 81041417. The next prime is 81041437. The reversal of 81041435 is 53414018.

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

It is a cyclic number.

It is not a de Polignac number, because 81041435 - 2⁶ = 81041371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81041437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8104139 + ... + 8104148.

It is an arithmetic number, because the mean of its divisors is an integer number (24312432).

Almost surely, 2^81041435 is an apocalyptic number.

81041435 is a deficient number, since it is larger than the sum of its proper divisors (16208293).

81041435 is a wasteful number, since it uses less digits than its factorization.

81041435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16208292.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 81041435 is about 9002.3016501337. The cubic root of 81041435 is about 432.7486358132.

The spelling of 81041435 in words is "eighty-one million, forty-one thousand, four hundred thirty-five".