81397041 has 32 divisors (see below), whose sum is σ = 123088896. Its totient is φ = 47400000.

The previous prime is 81397033. The next prime is 81397067. The reversal of 81397041 is 14079318.

It is not a de Polignac number, because 81397041 - 2³ = 81397033 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 81396993 and 81397011.

It is not an unprimeable number, because it can be changed into a prime (81397031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 256615 + ... + 256931.

It is an arithmetic number, because the mean of its divisors is an integer number (3846528).

Almost surely, 2^81397041 is an apocalyptic number.

It is an amenable number.

81397041 is a deficient number, since it is larger than the sum of its proper divisors (41691855).

81397041 is a wasteful number, since it uses less digits than its factorization.

81397041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81397041 is about 9022.0308689341. The cubic root of 81397041 is about 433.3806724746.

The spelling of 81397041 in words is "eighty-one million, three hundred ninety-seven thousand, forty-one".