81147532 has 6 divisors (see below), whose sum is σ = 142008188. Its totient is φ = 40573764.

The previous prime is 81147527. The next prime is 81147571. The reversal of 81147532 is 23574118.

It is a junction number, because it is equal to n+sod(n) for n = 81147494 and 81147503.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 10143438 + ... + 10143445.

Almost surely, 2^81147532 is an apocalyptic number.

It is an amenable number.

81147532 is a deficient number, since it is larger than the sum of its proper divisors (60860656).

81147532 is a wasteful number, since it uses less digits than its factorization.

81147532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20286887 (or 20286885 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 81147532 is about 9008.1924935028. The cubic root of 81147532 is about 432.9374006117.

The spelling of 81147532 in words is "eighty-one million, one hundred forty-seven thousand, five hundred thirty-two".