81841837 has 8 divisors (see below), whose sum is σ = 102036672. Its totient is φ = 63772800.

The previous prime is 81841831. The next prime is 81841871. The reversal of 81841837 is 73814818.

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

It is not a de Polignac number, because 81841837 - 2¹⁵ = 81809069 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81841837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81841831) 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, 531364 + ... + 531517.

It is an arithmetic number, because the mean of its divisors is an integer number (12754584).

Almost surely, 2^81841837 is an apocalyptic number.

It is an amenable number.

81841837 is a deficient number, since it is larger than the sum of its proper divisors (20194835).

81841837 is a wasteful number, since it uses less digits than its factorization.

81841837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062899.

The product of its digits is 43008, while the sum is 40.

The square root of 81841837 is about 9046.6478322083. The cubic root of 81841837 is about 434.1686451273.

The spelling of 81841837 in words is "eighty-one million, eight hundred forty-one thousand, eight hundred thirty-seven".