81747514 has 8 divisors (see below), whose sum is σ = 123244308. Its totient is φ = 40666080.

The previous prime is 81747511. The next prime is 81747529. The reversal of 81747514 is 41574718.

It can be written as a sum of positive squares in 2 ways, for example, as 80013025 + 1734489 = 8945^2 + 1317^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (81747511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103347 + ... + 104134.

Almost surely, 2^81747514 is an apocalyptic number.

81747514 is a deficient number, since it is larger than the sum of its proper divisors (41496794).

81747514 is a wasteful number, since it uses less digits than its factorization.

81747514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207680.

The product of its digits is 31360, while the sum is 37.

The square root of 81747514 is about 9041.4331828533. The cubic root of 81747514 is about 434.0017873881.

The spelling of 81747514 in words is "eighty-one million, seven hundred forty-seven thousand, five hundred fourteen".