81755503 has 2 divisors, whose sum is σ = 81755504. Its totient is φ = 81755502.

The previous prime is 81755483. The next prime is 81755539. The reversal of 81755503 is 30555718.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81755503 - 2²¹ = 79658351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81755543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40877751 + 40877752.

It is an arithmetic number, because the mean of its divisors is an integer number (40877752).

Almost surely, 2^81755503 is an apocalyptic number.

81755503 is a deficient number, since it is larger than the sum of its proper divisors (1).

81755503 is an equidigital number, since it uses as much as digits as its factorization.

81755503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 34.

The square root of 81755503 is about 9041.8749714868. The cubic root of 81755503 is about 434.0159249326.

The spelling of 81755503 in words is "eighty-one million, seven hundred fifty-five thousand, five hundred three".