81033701 has 6 divisors (see below), whose sum is σ = 94263750. Its totient is φ = 69457416.

The previous prime is 81033691. The next prime is 81033709. The reversal of 81033701 is 10733018.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 57365476 + 23668225 = 7574^2 + 4865^2 .

It is not a de Polignac number, because 81033701 - 2⁶ = 81033637 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81033709) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 826826 + ... + 826923.

It is an arithmetic number, because the mean of its divisors is an integer number (15710625).

Almost surely, 2^81033701 is an apocalyptic number.

It is an amenable number.

81033701 is a deficient number, since it is larger than the sum of its proper divisors (13230049).

81033701 is a wasteful number, since it uses less digits than its factorization.

81033701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1653763 (or 1653756 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 81033701 is about 9001.8720830725. The cubic root of 81033701 is about 432.7348692569.

Adding to 81033701 its reverse (10733018), we get a palindrome (91766719).

The spelling of 81033701 in words is "eighty-one million, thirty-three thousand, seven hundred one".