81446158 has 4 divisors (see below), whose sum is σ = 122169240. Its totient is φ = 40723078.

The previous prime is 81446149. The next prime is 81446177. The reversal of 81446158 is 85164418.

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

It is a congruent 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 as a sum of consecutive naturals, namely, 20361538 + ... + 20361541.

It is an arithmetic number, because the mean of its divisors is an integer number (30542310).

Almost surely, 2^81446158 is an apocalyptic number.

81446158 is a deficient number, since it is larger than the sum of its proper divisors (40723082).

81446158 is a wasteful number, since it uses less digits than its factorization.

81446158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40723081.

The product of its digits is 30720, while the sum is 37.

The square root of 81446158 is about 9024.7525173824. The cubic root of 81446158 is about 433.4678258407.

The spelling of 81446158 in words is "eighty-one million, four hundred forty-six thousand, one hundred fifty-eight".