81374467 has 4 divisors (see below), whose sum is σ = 81398520. Its totient is φ = 81350416.

The previous prime is 81374459. The next prime is 81374477. The reversal of 81374467 is 76447318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76447318 = 2 ⋅38223659.

It is a cyclic number.

It is not a de Polignac number, because 81374467 - 2³ = 81374459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81374407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5917 + ... + 14062.

It is an arithmetic number, because the mean of its divisors is an integer number (20349630).

Almost surely, 2^81374467 is an apocalyptic number.

81374467 is a deficient number, since it is larger than the sum of its proper divisors (24053).

81374467 is a wasteful number, since it uses less digits than its factorization.

81374467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24052.

The product of its digits is 112896, while the sum is 40.

The square root of 81374467 is about 9020.7797334820. The cubic root of 81374467 is about 433.3406053349.

The spelling of 81374467 in words is "eighty-one million, three hundred seventy-four thousand, four hundred sixty-seven".