81700303 has 4 divisors (see below), whose sum is σ = 82684728. Its totient is φ = 80715880.

The previous prime is 81700291. The next prime is 81700343. The reversal of 81700303 is 30300718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81700303 - 2⁵ = 81700271 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 (81700343) 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, 492088 + ... + 492253.

It is an arithmetic number, because the mean of its divisors is an integer number (20671182).

Almost surely, 2^81700303 is an apocalyptic number.

81700303 is a gapful number since it is divisible by the number (83) formed by its first and last digit.

81700303 is a deficient number, since it is larger than the sum of its proper divisors (984425).

81700303 is an equidigital number, since it uses as much as digits as its factorization.

81700303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984424.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 81700303 is about 9038.8219918306. The cubic root of 81700303 is about 433.9182227509.

The spelling of 81700303 in words is "eighty-one million, seven hundred thousand, three hundred three".