81320283 has 24 divisors (see below), whose sum is σ = 128456640. Its totient is φ = 49163760.

The previous prime is 81320273. The next prime is 81320297. The reversal of 81320283 is 38202318.

It is not a de Polignac number, because 81320283 - 2⁶ = 81320219 is a prime.

It is a super-2 number, since 2×81320283² = 13225976854400178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81320273) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55008 + ... + 56466.

It is an arithmetic number, because the mean of its divisors is an integer number (5352360).

Almost surely, 2^81320283 is an apocalyptic number.

81320283 is a deficient number, since it is larger than the sum of its proper divisors (47136357).

81320283 is a wasteful number, since it uses less digits than its factorization.

81320283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039 (or 2036 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 81320283 is about 9017.7759453204. The cubic root of 81320283 is about 433.2444025920.

The spelling of 81320283 in words is "eighty-one million, three hundred twenty thousand, two hundred eighty-three".