81755903 has 8 divisors (see below), whose sum is σ = 84137472. Its totient is φ = 79383456.

The previous prime is 81755893. The next prime is 81755909. The reversal of 81755903 is 30955718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81755903 - 2⁸ = 81755647 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 (81755909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18626 + ... + 22592.

It is an arithmetic number, because the mean of its divisors is an integer number (10517184).

Almost surely, 2^81755903 is an apocalyptic number.

81755903 is a deficient number, since it is larger than the sum of its proper divisors (2381569).

81755903 is a wasteful number, since it uses less digits than its factorization.

81755903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4561.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 81755903 is about 9041.8970907659. The cubic root of 81755903 is about 434.0166327589.

The spelling of 81755903 in words is "eighty-one million, seven hundred fifty-five thousand, nine hundred three".