81143410 has 16 divisors (see below), whose sum is σ = 147565656. Its totient is φ = 32122368.

The previous prime is 81143407. The next prime is 81143411. The reversal of 81143410 is 1434118.

It can be written as a sum of positive squares in 4 ways, for example, as 33767721 + 47375689 = 5811^2 + 6883^2 .

It is not an unprimeable number, because it can be changed into a prime (81143411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40857 + ... + 42796.

Almost surely, 2^81143410 is an apocalyptic number.

81143410 is a deficient number, since it is larger than the sum of its proper divisors (66422246).

81143410 is a wasteful number, since it uses less digits than its factorization.

81143410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83757.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 81143410 is about 9007.9636988611. The cubic root of 81143410 is about 432.9300699382.

Adding to 81143410 its reverse (1434118), we get a palindrome (82577528).

The spelling of 81143410 in words is "eighty-one million, one hundred forty-three thousand, four hundred ten".