81154 has 4 divisors (see below), whose sum is σ = 121734. Its totient is φ = 40576.

The previous prime is 81131. The next prime is 81157. The reversal of 81154 is 45118.

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

It can be written as a sum of positive squares in only one way, i.e., 65025 + 16129 = 255^2 + 127^2 .

It is not an unprimeable number, because it can be changed into a prime (81157) by changing a digit.

81154 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20287 + ... + 20290.

2⁸¹¹⁵⁴ is an apocalyptic number.

81154 is a deficient number, since it is larger than the sum of its proper divisors (40580).

81154 is a wasteful number, since it uses less digits than its factorization.

81154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40579.

The product of its digits is 160, while the sum is 19.

The square root of 81154 is about 284.8754113643. The cubic root of 81154 is about 43.2948902973.

The spelling of 81154 in words is "eighty-one thousand, one hundred fifty-four".