81037005 has 16 divisors (see below), whose sum is σ = 148182144. Its totient is φ = 37045440.

The previous prime is 81036997. The next prime is 81037091. The reversal of 81037005 is 50073018.

It is not a de Polignac number, because 81037005 - 2³ = 81036997 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 385786 + ... + 385995.

It is an arithmetic number, because the mean of its divisors is an integer number (9261384).

Almost surely, 2^81037005 is an apocalyptic number.

It is an amenable number.

81037005 is a deficient number, since it is larger than the sum of its proper divisors (67145139).

81037005 is a wasteful number, since it uses less digits than its factorization.

81037005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771796.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 81037005 is about 9002.0555985841. The cubic root of 81037005 is about 432.7407504996.

The spelling of 81037005 in words is "eighty-one million, thirty-seven thousand, five".