81061982 has 8 divisors (see below), whose sum is σ = 126879696. Its totient is φ = 38768752.

The previous prime is 81061973. The next prime is 81061991. The reversal of 81061982 is 28916018.

It is an interprime number because it is at equal distance from previous prime (81061973) and next prime (81061991).

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, 881063 + ... + 881154.

It is an arithmetic number, because the mean of its divisors is an integer number (15859962).

Almost surely, 2^81061982 is an apocalyptic number.

81061982 is a deficient number, since it is larger than the sum of its proper divisors (45817714).

81061982 is a wasteful number, since it uses less digits than its factorization.

81061982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762242.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 81061982 is about 9003.4427859569. The cubic root of 81061982 is about 432.7852053156.

The spelling of 81061982 in words is "eighty-one million, sixty-one thousand, nine hundred eighty-two".