81431230 has 16 divisors (see below), whose sum is σ = 147274704. Its totient is φ = 32417280.

The previous prime is 81431227. The next prime is 81431237. The reversal of 81431230 is 3213418.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81431237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17187 + ... + 21406.

It is an arithmetic number, because the mean of its divisors is an integer number (9204669).

Almost surely, 2^81431230 is an apocalyptic number.

81431230 is a deficient number, since it is larger than the sum of its proper divisors (65843474).

81431230 is a wasteful number, since it uses less digits than its factorization.

81431230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38811.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 81431230 is about 9023.9254207911. The cubic root of 81431230 is about 433.4413412557.

Adding to 81431230 its reverse (3213418), we get a palindrome (84644648).

The spelling of 81431230 in words is "eighty-one million, four hundred thirty-one thousand, two hundred thirty".