81144063 has 48 divisors (see below), whose sum is σ = 157387776. Its totient is φ = 38905920.

The previous prime is 81144061. The next prime is 81144083. The reversal of 81144063 is 36044118.

It is a Cunningham number, because it is equal to 9008²-1.

It is not a de Polignac number, because 81144063 - 2¹ = 81144061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81144061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4506 + ... + 13512.

It is an arithmetic number, because the mean of its divisors is an integer number (3278912).

Almost surely, 2^81144063 is an apocalyptic number.

81144063 is a deficient number, since it is larger than the sum of its proper divisors (76243713).

81144063 is a wasteful number, since it uses less digits than its factorization.

81144063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9044 (or 9041 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 81144063 is about 9007.9999444938. Note that the first 4 decimals coincide. The cubic root of 81144063 is about 432.9312312672.

The spelling of 81144063 in words is "eighty-one million, one hundred forty-four thousand, sixty-three".