81454367 has 4 divisors (see below), whose sum is σ = 81476616. Its totient is φ = 81432120.

The previous prime is 81454363. The next prime is 81454381. The reversal of 81454367 is 76345418.

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 81454367 - 2² = 81454363 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81454367.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81454363) 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, 4193 + ... + 13434.

It is an arithmetic number, because the mean of its divisors is an integer number (20369154).

Almost surely, 2^81454367 is an apocalyptic number.

81454367 is a deficient number, since it is larger than the sum of its proper divisors (22249).

81454367 is a wasteful number, since it uses less digits than its factorization.

81454367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22248.

The product of its digits is 80640, while the sum is 38.

The square root of 81454367 is about 9025.2073106384. The cubic root of 81454367 is about 433.4823884996.

The spelling of 81454367 in words is "eighty-one million, four hundred fifty-four thousand, three hundred sixty-seven".