81219082 has 32 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 33432000.

The previous prime is 81219079. The next prime is 81219113. The reversal of 81219082 is 28091218.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101508 + ... + 102304.

It is an arithmetic number, because the mean of its divisors is an integer number (4524660).

Almost surely, 2^81219082 is an apocalyptic number.

81219082 is a deficient number, since it is larger than the sum of its proper divisors (63570038).

81219082 is a wasteful number, since it uses less digits than its factorization.

81219082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1086.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 81219082 is about 9012.1630034082. The cubic root of 81219082 is about 433.0646074837.

The spelling of 81219082 in words is "eighty-one million, two hundred nineteen thousand, eighty-two".