81513382 has 8 divisors (see below), whose sum is σ = 128705400. Its totient is φ = 38611584.

The previous prime is 81513379. The next prime is 81513427. The reversal of 81513382 is 28331518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072507 + ... + 1072582.

It is an arithmetic number, because the mean of its divisors is an integer number (16088175).

Almost surely, 2^81513382 is an apocalyptic number.

81513382 is a deficient number, since it is larger than the sum of its proper divisors (47192018).

81513382 is a wasteful number, since it uses less digits than its factorization.

81513382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145110.

The product of its digits is 5760, while the sum is 31.

The square root of 81513382 is about 9028.4761726440. The cubic root of 81513382 is about 433.5870515496.

The spelling of 81513382 in words is "eighty-one million, five hundred thirteen thousand, three hundred eighty-two".