81047135 has 8 divisors (see below), whose sum is σ = 104737920. Its totient is φ = 59850144.

The previous prime is 81047107. The next prime is 81047137. The reversal of 81047135 is 53174018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81047135 - 2⁸ = 81046879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81047098 and 81047107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81047137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623375 + ... + 623504.

It is an arithmetic number, because the mean of its divisors is an integer number (13092240).

Almost surely, 2^81047135 is an apocalyptic number.

81047135 is a deficient number, since it is larger than the sum of its proper divisors (23690785).

81047135 is a wasteful number, since it uses less digits than its factorization.

81047135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246897.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 81047135 is about 9002.6182302706. The cubic root of 81047135 is about 432.7587812793.

The spelling of 81047135 in words is "eighty-one million, forty-seven thousand, one hundred thirty-five".