81389158 has 8 divisors (see below), whose sum is σ = 123269328. Its totient is φ = 40299384.

The previous prime is 81389137. The next prime is 81389177. The reversal of 81389158 is 85198318.

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, 197341 + ... + 197752.

It is an arithmetic number, because the mean of its divisors is an integer number (15408666).

Almost surely, 2^81389158 is an apocalyptic number.

81389158 is a deficient number, since it is larger than the sum of its proper divisors (41880170).

81389158 is a wasteful number, since it uses less digits than its factorization.

81389158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 395198.

The product of its digits is 69120, while the sum is 43.

The square root of 81389158 is about 9021.5939833269. The cubic root of 81389158 is about 433.3666815887.

The spelling of 81389158 in words is "eighty-one million, three hundred eighty-nine thousand, one hundred fifty-eight".