81943097 has 2 divisors, whose sum is σ = 81943098. Its totient is φ = 81943096.

The previous prime is 81943093. The next prime is 81943139. The reversal of 81943097 is 79034918.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79370281 + 2572816 = 8909^2 + 1604^2 .

It is a cyclic number.

It is not a de Polignac number, because 81943097 - 2² = 81943093 is a prime.

It is a super-2 number, since 2×81943097² = 13429342291902818, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81943091) 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 as a sum of consecutive naturals, namely, 40971548 + 40971549.

It is an arithmetic number, because the mean of its divisors is an integer number (40971549).

Almost surely, 2^81943097 is an apocalyptic number.

It is an amenable number.

81943097 is a deficient number, since it is larger than the sum of its proper divisors (1).

81943097 is an equidigital number, since it uses as much as digits as its factorization.

81943097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 81943097 is about 9052.2426503050. The cubic root of 81943097 is about 434.3476318143.

The spelling of 81943097 in words is "eighty-one million, nine hundred forty-three thousand, ninety-seven".