81281314 has 4 divisors (see below), whose sum is σ = 121921974. Its totient is φ = 40640656.

The previous prime is 81281281. The next prime is 81281323. The reversal of 81281314 is 41318218.

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

It can be written as a sum of positive squares in only one way, i.e., 80407089 + 874225 = 8967^2 + 935^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20320327 + ... + 20320330.

Almost surely, 2^81281314 is an apocalyptic number.

81281314 is a deficient number, since it is larger than the sum of its proper divisors (40640660).

81281314 is a wasteful number, since it uses less digits than its factorization.

81281314 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40640659.

The product of its digits is 1536, while the sum is 28.

The square root of 81281314 is about 9015.6150095265. The cubic root of 81281314 is about 433.1751873932.

The spelling of 81281314 in words is "eighty-one million, two hundred eighty-one thousand, three hundred fourteen".