81140167 has 4 divisors (see below), whose sum is σ = 85913136. Its totient is φ = 76367200.

The previous prime is 81140141. The next prime is 81140239. The reversal of 81140167 is 76104118.

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 81140167 - 2¹⁵ = 81107399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81140467) 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, 2386459 + ... + 2386492.

It is an arithmetic number, because the mean of its divisors is an integer number (21478284).

Almost surely, 2^81140167 is an apocalyptic number.

81140167 is a deficient number, since it is larger than the sum of its proper divisors (4772969).

81140167 is a wasteful number, since it uses less digits than its factorization.

81140167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772968.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81140167 is about 9007.7836896764. The cubic root of 81140167 is about 432.9243023270.

The spelling of 81140167 in words is "eighty-one million, one hundred forty thousand, one hundred sixty-seven".