81510332 has 12 divisors (see below), whose sum is σ = 142955736. Its totient is φ = 40665840.

The previous prime is 81510313. The next prime is 81510349. The reversal of 81510332 is 23301518.

It is a junction number, because it is equal to n+sod(n) for n = 81510298 and 81510307.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20258 + ... + 23945.

It is an arithmetic number, because the mean of its divisors is an integer number (11912978).

Almost surely, 2^81510332 is an apocalyptic number.

It is an amenable number.

81510332 is a deficient number, since it is larger than the sum of its proper divisors (61445404).

81510332 is a wasteful number, since it uses less digits than its factorization.

81510332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44668 (or 44666 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 81510332 is about 9028.3072610540. The cubic root of 81510332 is about 433.5816436154.

The spelling of 81510332 in words is "eighty-one million, five hundred ten thousand, three hundred thirty-two".