81151277 has 8 divisors (see below), whose sum is σ = 83160000. Its totient is φ = 79148160.

The previous prime is 81151247. The next prime is 81151283. The reversal of 81151277 is 77215118.

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 81151277 - 2²⁴ = 64374061 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 (81151247) 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, 52952 + ... + 54462.

It is an arithmetic number, because the mean of its divisors is an integer number (10395000).

Almost surely, 2^81151277 is an apocalyptic number.

It is an amenable number.

81151277 is a deficient number, since it is larger than the sum of its proper divisors (2008723).

81151277 is a wasteful number, since it uses less digits than its factorization.

81151277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803.

The product of its digits is 3920, while the sum is 32.

The square root of 81151277 is about 9008.4003574442. The cubic root of 81151277 is about 432.9440606032.

The spelling of 81151277 in words is "eighty-one million, one hundred fifty-one thousand, two hundred seventy-seven".