81042163 has 4 divisors (see below), whose sum is σ = 85307560. Its totient is φ = 76776768.

The previous prime is 81042119. The next prime is 81042187. The reversal of 81042163 is 36124018.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81042163 - 2¹³ = 81033971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81042103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2132670 + ... + 2132707.

It is an arithmetic number, because the mean of its divisors is an integer number (21326890).

Almost surely, 2^81042163 is an apocalyptic number.

81042163 is a deficient number, since it is larger than the sum of its proper divisors (4265397).

81042163 is a wasteful number, since it uses less digits than its factorization.

81042163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4265396.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81042163 is about 9002.3420841468. The cubic root of 81042163 is about 432.7499316115.

The spelling of 81042163 in words is "eighty-one million, forty-two thousand, one hundred sixty-three".