81319283 has 16 divisors (see below), whose sum is σ = 87048000. Its totient is φ = 75799680.

The previous prime is 81319267. The next prime is 81319289. The reversal of 81319283 is 38291318.

It is a cyclic number.

It is not a de Polignac number, because 81319283 - 2⁴ = 81319267 is a prime.

It is a super-2 number, since 2×81319283² = 13225651575268178, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81319289) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208853 + ... + 209241.

It is an arithmetic number, because the mean of its divisors is an integer number (5440500).

Almost surely, 2^81319283 is an apocalyptic number.

81319283 is a deficient number, since it is larger than the sum of its proper divisors (5728717).

81319283 is a wasteful number, since it uses less digits than its factorization.

81319283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622.

The product of its digits is 10368, while the sum is 35.

The square root of 81319283 is about 9017.7204991062. The cubic root of 81319283 is about 433.2426267080.

The spelling of 81319283 in words is "eighty-one million, three hundred nineteen thousand, two hundred eighty-three".