81034147 has 4 divisors (see below), whose sum is σ = 81130000. Its totient is φ = 80938296.

The previous prime is 81034139. The next prime is 81034153. The reversal of 81034147 is 74143018.

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 81034147 - 2³ = 81034139 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 (81034127) 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, 46647 + ... + 48352.

It is an arithmetic number, because the mean of its divisors is an integer number (20282500).

Almost surely, 2^81034147 is an apocalyptic number.

81034147 is a deficient number, since it is larger than the sum of its proper divisors (95853).

81034147 is an equidigital number, since it uses as much as digits as its factorization.

81034147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95852.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 81034147 is about 9001.8968556633. The cubic root of 81034147 is about 432.7356631628.

The spelling of 81034147 in words is "eighty-one million, thirty-four thousand, one hundred forty-seven".