81841463 has 8 divisors (see below), whose sum is σ = 90285840. Its totient is φ = 73564480.

The previous prime is 81841439. The next prime is 81841469. The reversal of 81841463 is 36414818.

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

It is not a de Polignac number, because 81841463 - 2¹⁰ = 81840439 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 (81841469) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40820 + ... + 42777.

It is an arithmetic number, because the mean of its divisors is an integer number (11285730).

Almost surely, 2^81841463 is an apocalyptic number.

81841463 is a deficient number, since it is larger than the sum of its proper divisors (8444377).

81841463 is a wasteful number, since it uses less digits than its factorization.

81841463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83697.

The product of its digits is 18432, while the sum is 35.

The square root of 81841463 is about 9046.6271615448. The cubic root of 81841463 is about 434.1679837731.

The spelling of 81841463 in words is "eighty-one million, eight hundred forty-one thousand, four hundred sixty-three".