81753653 has 4 divisors (see below), whose sum is σ = 81940320. Its totient is φ = 81566988.

The previous prime is 81753647. The next prime is 81753677. The reversal of 81753653 is 35635718.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 81753653 - 2¹⁴ = 81737269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81753643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92675 + ... + 93552.

It is an arithmetic number, because the mean of its divisors is an integer number (20485080).

Almost surely, 2^81753653 is an apocalyptic number.

It is an amenable number.

81753653 is a deficient number, since it is larger than the sum of its proper divisors (186667).

81753653 is a wasteful number, since it uses less digits than its factorization.

81753653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186666.

The product of its digits is 75600, while the sum is 38.

The square root of 81753653 is about 9041.7726691175. The cubic root of 81753653 is about 434.0126512059.

The spelling of 81753653 in words is "eighty-one million, seven hundred fifty-three thousand, six hundred fifty-three".