81337152 has 56 divisors (see below), whose sum is σ = 231765856. Its totient is φ = 25026048.

The previous prime is 81337133. The next prime is 81337181. The reversal of 81337152 is 25173318.

It is a super-2 number, since 2×81337152² = 13231464590942208, which contains 22 as substring.

It is a congruent number.

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, 13798 + ... + 18789.

It is an arithmetic number, because the mean of its divisors is an integer number (4138676).

Almost surely, 2^81337152 is an apocalyptic number.

It is an amenable number.

81337152 is an abundant number, since it is smaller than the sum of its proper divisors (150428704).

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

81337152 is a wasteful number, since it uses less digits than its factorization.

81337152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32615 (or 32605 counting only the distinct ones).

The product of its digits is 5040, while the sum is 30.

The square root of 81337152 is about 9018.7112161328. The cubic root of 81337152 is about 433.2743577859.

The spelling of 81337152 in words is "eighty-one million, three hundred thirty-seven thousand, one hundred fifty-two".