81375082 has 4 divisors (see below), whose sum is σ = 122062626. Its totient is φ = 40687540.

The previous prime is 81375079. The next prime is 81375089. The reversal of 81375082 is 28057318.

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., 56385081 + 24990001 = 7509^2 + 4999^2 .

It is not an unprimeable number, because it can be changed into a prime (81375089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20343769 + ... + 20343772.

Almost surely, 2^81375082 is an apocalyptic number.

81375082 is a deficient number, since it is larger than the sum of its proper divisors (40687544).

81375082 is a wasteful number, since it uses less digits than its factorization.

81375082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40687543.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 81375082 is about 9020.8138213800. The cubic root of 81375082 is about 433.3416970115.

The spelling of 81375082 in words is "eighty-one million, three hundred seventy-five thousand, eighty-two".