81121014 has 60 divisors (see below), whose sum is σ = 196895556. Its totient is φ = 24951888.

The previous prime is 81120997. The next prime is 81121021. The reversal of 81121014 is 41012118.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 25897 + ... + 28859.

Almost surely, 2^81121014 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81121014, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98447778).

81121014 is an abundant number, since it is smaller than the sum of its proper divisors (115774542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81121014 is a wasteful number, since it uses less digits than its factorization.

81121014 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3003 (or 2981 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81121014 is about 9006.7204908335. The cubic root of 81121014 is about 432.8902359619.

The spelling of 81121014 in words is "eighty-one million, one hundred twenty-one thousand, fourteen".