81279011 has 8 divisors (see below), whose sum is σ = 89482800. Its totient is φ = 73211040.

The previous prime is 81279007. The next prime is 81279013. The reversal of 81279011 is 11097218.

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 81279011 - 2² = 81279007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81279013) 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 7 ways as a sum of consecutive naturals, for example, 32696 + ... + 35093.

It is an arithmetic number, because the mean of its divisors is an integer number (11185350).

Almost surely, 2^81279011 is an apocalyptic number.

81279011 is a deficient number, since it is larger than the sum of its proper divisors (8203789).

81279011 is a wasteful number, since it uses less digits than its factorization.

81279011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67909.

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 81279011 is about 9015.4872857766. The cubic root of 81279011 is about 433.1710962033.

The spelling of 81279011 in words is "eighty-one million, two hundred seventy-nine thousand, eleven".