81321046 has 8 divisors (see below), whose sum is σ = 126187920. Its totient is φ = 39258408.

The previous prime is 81321043. The next prime is 81321089. The reversal of 81321046 is 64012318.

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

It is a super-2 number, since 2×81321046² = 13226225045068232, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81321046.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81321043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 700986 + ... + 701101.

It is an arithmetic number, because the mean of its divisors is an integer number (15773490).

Almost surely, 2^81321046 is an apocalyptic number.

81321046 is a deficient number, since it is larger than the sum of its proper divisors (44866874).

81321046 is a wasteful number, since it uses less digits than its factorization.

81321046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402118.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 81321046 is about 9017.8182505526. The cubic root of 81321046 is about 433.2457575817.

The spelling of 81321046 in words is "eighty-one million, three hundred twenty-one thousand, forty-six".