81158151 has 4 divisors (see below), whose sum is σ = 108210872. Its totient is φ = 54105432.

The previous prime is 81158149. The next prime is 81158171. The reversal of 81158151 is 15185118.

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

It is not a de Polignac number, because 81158151 - 2¹ = 81158149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81158111) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 13526356 + ... + 13526361.

It is an arithmetic number, because the mean of its divisors is an integer number (27052718).

Almost surely, 2^81158151 is an apocalyptic number.

81158151 is a deficient number, since it is larger than the sum of its proper divisors (27052721).

81158151 is a wasteful number, since it uses less digits than its factorization.

81158151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27052720.

The product of its digits is 1600, while the sum is 30.

The square root of 81158151 is about 9008.7818821414. The cubic root of 81158151 is about 432.9562845778.

The spelling of 81158151 in words is "eighty-one million, one hundred fifty-eight thousand, one hundred fifty-one".