81044937 has 48 divisors (see below), whose sum is σ = 130104000. Its totient is φ = 48408192.

The previous prime is 81044927. The next prime is 81044941. The reversal of 81044937 is 73944018.

It is a happy number.

It is not a de Polignac number, because 81044937 - 2¹¹ = 81042889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81044927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 292443 + ... + 292719.

It is an arithmetic number, because the mean of its divisors is an integer number (2710500).

Almost surely, 2^81044937 is an apocalyptic number.

81044937 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

It is an amenable number.

81044937 is a deficient number, since it is larger than the sum of its proper divisors (49059063).

81044937 is a wasteful number, since it uses less digits than its factorization.

81044937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 81044937 is about 9002.4961538453. The cubic root of 81044937 is about 432.7548691015.

It can be divided in two parts, 8104 and 4937, that added together give a triangular number (13041 = T₁₆₁).

The spelling of 81044937 in words is "eighty-one million, forty-four thousand, nine hundred thirty-seven".