81017294 has 4 divisors (see below), whose sum is σ = 121525944. Its totient is φ = 40508646.

The previous prime is 81017281. The next prime is 81017303. The reversal of 81017294 is 49271018.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81017294.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20254322 + ... + 20254325.

It is an arithmetic number, because the mean of its divisors is an integer number (30381486).

Almost surely, 2^81017294 is an apocalyptic number.

81017294 is a deficient number, since it is larger than the sum of its proper divisors (40508650).

81017294 is a wasteful number, since it uses less digits than its factorization.

81017294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40508649.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 81017294 is about 9000.9607265003. The cubic root of 81017294 is about 432.7056618196.

The spelling of 81017294 in words is "eighty-one million, seventeen thousand, two hundred ninety-four".