81011532 has 24 divisors (see below), whose sum is σ = 216030976. Its totient is φ = 23146128.

The previous prime is 81011521. The next prime is 81011549. The reversal of 81011532 is 23511018.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 81011499 and 81011508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 482128 + ... + 482295.

Almost surely, 2^81011532 is an apocalyptic number.

It is an amenable number.

81011532 is an abundant number, since it is smaller than the sum of its proper divisors (135019444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81011532 is a wasteful number, since it uses less digits than its factorization.

81011532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964437 (or 964435 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 81011532 is about 9000.6406438653. The cubic root of 81011532 is about 432.6954034784.

The spelling of 81011532 in words is "eighty-one million, eleven thousand, five hundred thirty-two".