81843097 has 4 divisors (see below), whose sum is σ = 93534976. Its totient is φ = 70151220.

The previous prime is 81843067. The next prime is 81843101. The reversal of 81843097 is 79034818.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79034818 = 2 ⋅39517409.

It is a cyclic number.

It is not a de Polignac number, because 81843097 - 2²³ = 73454489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81843067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5845929 + ... + 5845942.

It is an arithmetic number, because the mean of its divisors is an integer number (23383744).

Almost surely, 2^81843097 is an apocalyptic number.

It is an amenable number.

81843097 is a deficient number, since it is larger than the sum of its proper divisors (11691879).

81843097 is a wasteful number, since it uses less digits than its factorization.

81843097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11691878.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 81843097 is about 9046.7174709947. The cubic root of 81843097 is about 434.1708732041.

The spelling of 81843097 in words is "eighty-one million, eight hundred forty-three thousand, ninety-seven".