81034947 has 12 divisors (see below), whose sum is σ = 133772080. Its totient is φ = 46305648.

The previous prime is 81034931. The next prime is 81034951. The reversal of 81034947 is 74943018.

It is a happy number.

It is not a de Polignac number, because 81034947 - 2⁴ = 81034931 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81030947) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 643072 + ... + 643197.

Almost surely, 2^81034947 is an apocalyptic number.

81034947 is a deficient number, since it is larger than the sum of its proper divisors (52737133).

81034947 is a wasteful number, since it uses less digits than its factorization.

81034947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286282 (or 1286279 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81034947 is about 9001.9412906328. The cubic root of 81034947 is about 432.7370872019.

The spelling of 81034947 in words is "eighty-one million, thirty-four thousand, nine hundred forty-seven".