81038811 has 8 divisors (see below), whose sum is σ = 123487744. Its totient is φ = 46307880.

The previous prime is 81038809. The next prime is 81038863. The reversal of 81038811 is 11883018.

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

It is not a de Polignac number, because 81038811 - 2¹ = 81038809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81038891) 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, 1929475 + ... + 1929516.

It is an arithmetic number, because the mean of its divisors is an integer number (15435968).

Almost surely, 2^81038811 is an apocalyptic number.

81038811 is a deficient number, since it is larger than the sum of its proper divisors (42448933).

81038811 is a wasteful number, since it uses less digits than its factorization.

81038811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859001.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 81038811 is about 9002.1559084477. The cubic root of 81038811 is about 432.7439651790.

It can be divided in two parts, 810 and 38811, that added together give a triangular number (39621 = T₂₈₁).

The spelling of 81038811 in words is "eighty-one million, thirty-eight thousand, eight hundred eleven".