81133241490 has 256 divisors, whose sum is σ = 250791690240. Its totient is φ = 18281687040.

The previous prime is 81133241471. The next prime is 81133241537. The reversal of 81133241490 is 9414233118.

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 127 ways as a sum of consecutive naturals, for example, 57014919 + ... + 57016341.

It is an arithmetic number, because the mean of its divisors is an integer number (979655040).

Almost surely, 2^81133241490 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81133241490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125395845120).

81133241490 is an abundant number, since it is smaller than the sum of its proper divisors (169658448750).

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

81133241490 is a wasteful number, since it uses less digits than its factorization.

81133241490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1848 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 81133241490 in words is "eighty-one billion, one hundred thirty-three million, two hundred forty-one thousand, four hundred ninety".