81143798 has 16 divisors (see below), whose sum is σ = 127219680. Its totient is φ = 38766336.

The previous prime is 81143791. The next prime is 81143801. The reversal of 81143798 is 89734118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81143791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586 + ... + 12837.

It is an arithmetic number, because the mean of its divisors is an integer number (7951230).

Almost surely, 2^81143798 is an apocalyptic number.

81143798 is a deficient number, since it is larger than the sum of its proper divisors (46075882).

81143798 is a wasteful number, since it uses less digits than its factorization.

81143798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14551.

The product of its digits is 48384, while the sum is 41.

The square root of 81143798 is about 9007.9852353343. The cubic root of 81143798 is about 432.9307599783.

The spelling of 81143798 in words is "eighty-one million, one hundred forty-three thousand, seven hundred ninety-eight".