81154277 has 8 divisors (see below), whose sum is σ = 86458176. Its totient is φ = 75909312.

The previous prime is 81154273. The next prime is 81154303. The reversal of 81154277 is 77245118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81154277 - 2² = 81154273 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 (81154273) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 11873 + ... + 17414.

It is an arithmetic number, because the mean of its divisors is an integer number (10807272).

Almost surely, 2^81154277 is an apocalyptic number.

It is an amenable number.

81154277 is a deficient number, since it is larger than the sum of its proper divisors (5303899).

81154277 is a wasteful number, since it uses less digits than its factorization.

81154277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29467.

The product of its digits is 15680, while the sum is 35.

The square root of 81154277 is about 9008.5668671548. The cubic root of 81154277 is about 432.9493955621.

The spelling of 81154277 in words is "eighty-one million, one hundred fifty-four thousand, two hundred seventy-seven".