81037582 has 4 divisors (see below), whose sum is σ = 121556376. Its totient is φ = 40518790.

The previous prime is 81037573. The next prime is 81037597. The reversal of 81037582 is 28573018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 28573018 = 2 ⋅14286509.

It is a congruent number.

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, 20259394 + ... + 20259397.

It is an arithmetic number, because the mean of its divisors is an integer number (30389094).

Almost surely, 2^81037582 is an apocalyptic number.

81037582 is a deficient number, since it is larger than the sum of its proper divisors (40518794).

81037582 is a wasteful number, since it uses less digits than its factorization.

81037582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40518793.

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

The square root of 81037582 is about 9002.0876467628. The cubic root of 81037582 is about 432.7417775646.

The spelling of 81037582 in words is "eighty-one million, thirty-seven thousand, five hundred eighty-two".