81967363 has 4 divisors (see below), whose sum is σ = 82011328. Its totient is φ = 81923400.

The previous prime is 81967351. The next prime is 81967439. The reversal of 81967363 is 36376918.

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 81967363 - 2²¹ = 79870211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81967763) 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, 19056 + ... + 22957.

It is an arithmetic number, because the mean of its divisors is an integer number (20502832).

Almost surely, 2^81967363 is an apocalyptic number.

81967363 is a deficient number, since it is larger than the sum of its proper divisors (43965).

81967363 is a wasteful number, since it uses less digits than its factorization.

81967363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43964.

The product of its digits is 163296, while the sum is 43.

The square root of 81967363 is about 9053.5828819313. The cubic root of 81967363 is about 434.3905023745.

The spelling of 81967363 in words is "eighty-one million, nine hundred sixty-seven thousand, three hundred sixty-three".