81035870223 has 32 divisors (see below), whose sum is σ = 134746836480. Its totient is φ = 42084725760.

The previous prime is 81035870221. The next prime is 81035870233. The reversal of 81035870223 is 32207853018.

It is a Cunningham number, because it is equal to 284668²-1.

It is not a de Polignac number, because 81035870223 - 2¹ = 81035870221 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81035870221) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 806563 + ... + 901451.

It is an arithmetic number, because the mean of its divisors is an integer number (4210838640).

Almost surely, 2^81035870223 is an apocalyptic number.

81035870223 is a deficient number, since it is larger than the sum of its proper divisors (53710966257).

81035870223 is a wasteful number, since it uses less digits than its factorization.

81035870223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98607.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 81035870223 in words is "eighty-one billion, thirty-five million, eight hundred seventy thousand, two hundred twenty-three".