81597852 has 36 divisors (see below), whose sum is σ = 235727856. Its totient is φ = 23313600.

The previous prime is 81597827. The next prime is 81597869. The reversal of 81597852 is 25879518.

It is a happy number.

81597852 is a `hidden beast` number, since 8 + 1 + 597 + 8 + 52 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 81597798 and 81597807.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 161649 + ... + 162152.

It is an arithmetic number, because the mean of its divisors is an integer number (6547996).

Almost surely, 2^81597852 is an apocalyptic number.

It is an amenable number.

81597852 is an abundant number, since it is smaller than the sum of its proper divisors (154130004).

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

81597852 is a wasteful number, since it uses less digits than its factorization.

81597852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323818 (or 323813 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 81597852 is about 9033.1529379282. The cubic root of 81597852 is about 433.7367711557.

The spelling of 81597852 in words is "eighty-one million, five hundred ninety-seven thousand, eight hundred fifty-two".