81294745 has 8 divisors (see below), whose sum is σ = 111489984. Its totient is φ = 55744944.

The previous prime is 81294727. The next prime is 81294751. The reversal of 81294745 is 54749218.

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 81294745 - 2⁹ = 81294233 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81294698 and 81294707.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161319 + ... + 1161388.

It is an arithmetic number, because the mean of its divisors is an integer number (13936248).

Almost surely, 2^81294745 is an apocalyptic number.

It is an amenable number.

81294745 is a deficient number, since it is larger than the sum of its proper divisors (30195239).

81294745 is a wasteful number, since it uses less digits than its factorization.

81294745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2322719.

The product of its digits is 80640, while the sum is 40.

The square root of 81294745 is about 9016.3598530671. The cubic root of 81294745 is about 433.1990455029.

The spelling of 81294745 in words is "eighty-one million, two hundred ninety-four thousand, seven hundred forty-five".