81474205 has 8 divisors (see below), whose sum is σ = 99108792. Its totient is φ = 64286208.

The previous prime is 81474191. The next prime is 81474227. The reversal of 81474205 is 50247418.

It can be written as a sum of positive squares in 4 ways, for example, as 22905796 + 58568409 = 4786^2 + 7653^2 .

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 81474205 - 2¹⁹ = 80949917 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 111244 + ... + 111973.

It is an arithmetic number, because the mean of its divisors is an integer number (12388599).

Almost surely, 2^81474205 is an apocalyptic number.

It is an amenable number.

81474205 is a deficient number, since it is larger than the sum of its proper divisors (17634587).

81474205 is a wasteful number, since it uses less digits than its factorization.

81474205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223295.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 81474205 is about 9026.3062766560. The cubic root of 81474205 is about 433.5175768138.

The spelling of 81474205 in words is "eighty-one million, four hundred seventy-four thousand, two hundred five".