81750501 has 48 divisors (see below), whose sum is σ = 146824704. Its totient is φ = 42757632.

The previous prime is 81750499. The next prime is 81750509. The reversal of 81750501 is 10505718.

It is not a de Polignac number, because 81750501 - 2¹ = 81750499 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 (81750509) 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 47 ways as a sum of consecutive naturals, for example, 38596 + ... + 40658.

It is an arithmetic number, because the mean of its divisors is an integer number (3058848).

Almost surely, 2^81750501 is an apocalyptic number.

It is an amenable number.

81750501 is a deficient number, since it is larger than the sum of its proper divisors (65074203).

81750501 is a wasteful number, since it uses less digits than its factorization.

81750501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2130 (or 2127 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 81750501 is about 9041.5983653334. The cubic root of 81750501 is about 434.0070733697.

The spelling of 81750501 in words is "eighty-one million, seven hundred fifty thousand, five hundred one".