81535282 has 4 divisors (see below), whose sum is σ = 122302926. Its totient is φ = 40767640.

The previous prime is 81535277. The next prime is 81535291. The reversal of 81535282 is 28253518.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 73633561 + 7901721 = 8581^2 + 2811^2 .

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 as a sum of consecutive naturals, namely, 20383819 + ... + 20383822.

Almost surely, 2^81535282 is an apocalyptic number.

81535282 is a deficient number, since it is larger than the sum of its proper divisors (40767644).

81535282 is a wasteful number, since it uses less digits than its factorization.

81535282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40767643.

The product of its digits is 19200, while the sum is 34.

The square root of 81535282 is about 9029.6889204446. The cubic root of 81535282 is about 433.6258783284.

The spelling of 81535282 in words is "eighty-one million, five hundred thirty-five thousand, two hundred eighty-two".