81474415 has 8 divisors (see below), whose sum is σ = 106657488. Its totient is φ = 59254080.

The previous prime is 81474391. The next prime is 81474461. The reversal of 81474415 is 51447418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81474415 - 2²⁵ = 47919983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 740622 + ... + 740731.

It is an arithmetic number, because the mean of its divisors is an integer number (13332186).

Almost surely, 2^81474415 is an apocalyptic number.

81474415 is a deficient number, since it is larger than the sum of its proper divisors (25183073).

81474415 is a wasteful number, since it uses less digits than its factorization.

81474415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481369.

The product of its digits is 17920, while the sum is 34.

The square root of 81474415 is about 9026.3179093139. The cubic root of 81474415 is about 433.5179492778.

The spelling of 81474415 in words is "eighty-one million, four hundred seventy-four thousand, four hundred fifteen".