81384297 has 16 divisors (see below), whose sum is σ = 110789952. Its totient is φ = 53127360.

The previous prime is 81384283. The next prime is 81384311. The reversal of 81384297 is 79248318.

It is an interprime number because it is at equal distance from previous prime (81384283) and next prime (81384311).

It is not a de Polignac number, because 81384297 - 2²⁰ = 80335721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81384227) 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, 35263 + ... + 37499.

It is an arithmetic number, because the mean of its divisors is an integer number (6924372).

Almost surely, 2^81384297 is an apocalyptic number.

It is an amenable number.

81384297 is a deficient number, since it is larger than the sum of its proper divisors (29405655).

81384297 is a wasteful number, since it uses less digits than its factorization.

81384297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488.

The product of its digits is 96768, while the sum is 42.

The square root of 81384297 is about 9021.3245701504. The cubic root of 81384297 is about 433.3580537508.

The spelling of 81384297 in words is "eighty-one million, three hundred eighty-four thousand, two hundred ninety-seven".