81374347 has 4 divisors (see below), whose sum is σ = 81393520. Its totient is φ = 81355176.

The previous prime is 81374333. The next prime is 81374369. The reversal of 81374347 is 74347318.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74347318 = 2 ⋅37173659.

It is a cyclic number.

It is not a de Polignac number, because 81374347 - 2⁷ = 81374219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81374317) 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, 72 + ... + 12757.

It is an arithmetic number, because the mean of its divisors is an integer number (20348380).

Almost surely, 2^81374347 is an apocalyptic number.

81374347 is a deficient number, since it is larger than the sum of its proper divisors (19173).

81374347 is a wasteful number, since it uses less digits than its factorization.

81374347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19172.

The product of its digits is 56448, while the sum is 37.

The square root of 81374347 is about 9020.7730821698. The cubic root of 81374347 is about 433.3403923242.

The spelling of 81374347 in words is "eighty-one million, three hundred seventy-four thousand, three hundred forty-seven".