81046331 has 4 divisors (see below), whose sum is σ = 81069912. Its totient is φ = 81022752.

The previous prime is 81046291. The next prime is 81046333. The reversal of 81046331 is 13364018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13364018 = 2 ⋅6682009.

It is a cyclic number.

It is not a de Polignac number, because 81046331 - 2¹⁴ = 81029947 is a prime.

It is a super-2 number, since 2×81046331² = 13137015537123122, which contains 22 as substring.

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 81046331.

It is not an unprimeable number, because it can be changed into a prime (81046333) 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, 5525 + ... + 13878.

It is an arithmetic number, because the mean of its divisors is an integer number (20267478).

Almost surely, 2^81046331 is an apocalyptic number.

81046331 is a deficient number, since it is larger than the sum of its proper divisors (23581).

81046331 is a wasteful number, since it uses less digits than its factorization.

81046331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23580.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 81046331 is about 9002.5735764836. The cubic root of 81046331 is about 432.7573502634.

The spelling of 81046331 in words is "eighty-one million, forty-six thousand, three hundred thirty-one".