81277011 has 12 divisors (see below), whose sum is σ = 117553488. Its totient is φ = 54113904.

The previous prime is 81276977. The next prime is 81277013. The reversal of 81277011 is 11077218.

It is not a de Polignac number, because 81277011 - 2⁹ = 81276499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81277013) 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 11 ways as a sum of consecutive naturals, for example, 1921 + ... + 12893.

It is an arithmetic number, because the mean of its divisors is an integer number (9796124).

Almost surely, 2^81277011 is an apocalyptic number.

81277011 is a deficient number, since it is larger than the sum of its proper divisors (36276477).

81277011 is a wasteful number, since it uses less digits than its factorization.

81277011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11802 (or 11799 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 81277011 is about 9015.3763648558. The cubic root of 81277011 is about 433.1675432184.

The spelling of 81277011 in words is "eighty-one million, two hundred seventy-seven thousand, eleven".