81473353 has 4 divisors (see below), whose sum is σ = 87740548. Its totient is φ = 75206160.

The previous prime is 81473351. The next prime is 81473377. The reversal of 81473353 is 35337418.

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

It can be written as a sum of positive squares in 2 ways, for example, as 48330304 + 33143049 = 6952^2 + 5757^2 .

It is a cyclic number.

It is not a de Polignac number, because 81473353 - 2¹ = 81473351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81473351) 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, 3133578 + ... + 3133603.

It is an arithmetic number, because the mean of its divisors is an integer number (21935137).

Almost surely, 2^81473353 is an apocalyptic number.

It is an amenable number.

81473353 is a deficient number, since it is larger than the sum of its proper divisors (6267195).

81473353 is a wasteful number, since it uses less digits than its factorization.

81473353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6267194.

The product of its digits is 30240, while the sum is 34.

The square root of 81473353 is about 9026.2590811476. The cubic root of 81473353 is about 433.5160656678.

The spelling of 81473353 in words is "eighty-one million, four hundred seventy-three thousand, three hundred fifty-three".