81202041 has 32 divisors (see below), whose sum is σ = 124992000. Its totient is φ = 52064640.

The previous prime is 81202031. The next prime is 81202049. The reversal of 81202041 is 14020218.

It is a de Polignac number, because none of the positive numbers 2^k-81202041 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81202049) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 76885 + ... + 77933.

It is an arithmetic number, because the mean of its divisors is an integer number (3906000).

Almost surely, 2^81202041 is an apocalyptic number.

It is an amenable number.

81202041 is a deficient number, since it is larger than the sum of its proper divisors (43789959).

81202041 is a wasteful number, since it uses less digits than its factorization.

81202041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166 (or 1160 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 81202041 is about 9011.2175093047. The cubic root of 81202041 is about 433.0343175158.

Adding to 81202041 its reverse (14020218), we get a palindrome (95222259).

The spelling of 81202041 in words is "eighty-one million, two hundred two thousand, forty-one".