81532017 has 48 divisors (see below), whose sum is σ = 143544960. Its totient is φ = 43531776.

The previous prime is 81532013. The next prime is 81532037. The reversal of 81532017 is 71023518.

It is not a de Polignac number, because 81532017 - 2² = 81532013 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81532013) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 287958 + ... + 288240.

It is an arithmetic number, because the mean of its divisors is an integer number (2990520).

Almost surely, 2^81532017 is an apocalyptic number.

It is an amenable number.

81532017 is a deficient number, since it is larger than the sum of its proper divisors (62012943).

81532017 is a wasteful number, since it uses less digits than its factorization.

81532017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 81532017 is about 9029.5081261384. The cubic root of 81532017 is about 433.6200902109.

The spelling of 81532017 in words is "eighty-one million, five hundred thirty-two thousand, seventeen".