81574743 has 4 divisors (see below), whose sum is σ = 108766328. Its totient is φ = 54383160.

The previous prime is 81574723. The next prime is 81574777. The reversal of 81574743 is 34747518.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 81574743 - 2⁸ = 81574487 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 (81574723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13595788 + ... + 13595793.

It is an arithmetic number, because the mean of its divisors is an integer number (27191582).

Almost surely, 2^81574743 is an apocalyptic number.

81574743 is a deficient number, since it is larger than the sum of its proper divisors (27191585).

81574743 is a wasteful number, since it uses less digits than its factorization.

81574743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27191584.

The product of its digits is 94080, while the sum is 39.

The square root of 81574743 is about 9031.8737258666. The cubic root of 81574743 is about 433.6958216733.

It can be divided in two parts, 8 and 1574743, that added together give a palindrome (1574751).

The spelling of 81574743 in words is "eighty-one million, five hundred seventy-four thousand, seven hundred forty-three".