81231476 has 12 divisors (see below), whose sum is σ = 142380672. Its totient is φ = 40551288.

The previous prime is 81231473. The next prime is 81231499. The reversal of 81231476 is 67413218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81231473) 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, 13220 + ... + 18363.

It is an arithmetic number, because the mean of its divisors is an integer number (11865056).

Almost surely, 2^81231476 is an apocalyptic number.

It is an amenable number.

81231476 is a deficient number, since it is larger than the sum of its proper divisors (61149196).

81231476 is a wasteful number, since it uses less digits than its factorization.

81231476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32230 (or 32228 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 81231476 is about 9012.8506034440. The cubic root of 81231476 is about 433.0866348596.

The spelling of 81231476 in words is "eighty-one million, two hundred thirty-one thousand, four hundred seventy-six".