81171446 has 8 divisors (see below), whose sum is σ = 121812120. Its totient is φ = 40567408.

The previous prime is 81171437. The next prime is 81171469. The reversal of 81171446 is 64417118.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2711 + ... + 13026.

It is an arithmetic number, because the mean of its divisors is an integer number (15226515).

Almost surely, 2^81171446 is an apocalyptic number.

81171446 is a deficient number, since it is larger than the sum of its proper divisors (40640674).

81171446 is a wasteful number, since it uses less digits than its factorization.

81171446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18318.

The product of its digits is 5376, while the sum is 32.

The square root of 81171446 is about 9009.5197430274. The cubic root of 81171446 is about 432.9799250027.

The spelling of 81171446 in words is "eighty-one million, one hundred seventy-one thousand, four hundred forty-six".