81846593 has 2 divisors, whose sum is σ = 81846594. Its totient is φ = 81846592.

The previous prime is 81846577. The next prime is 81846631. The reversal of 81846593 is 39564818.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62283664 + 19562929 = 7892^2 + 4423^2 .

It is a cyclic number.

It is not a de Polignac number, because 81846593 - 2⁴ = 81846577 is a prime.

It is not a weakly prime, because it can be changed into another prime (81846493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40923296 + 40923297.

It is an arithmetic number, because the mean of its divisors is an integer number (40923297).

Almost surely, 2^81846593 is an apocalyptic number.

It is an amenable number.

81846593 is a deficient number, since it is larger than the sum of its proper divisors (1).

81846593 is an equidigital number, since it uses as much as digits as its factorization.

81846593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 44.

The square root of 81846593 is about 9046.9106881852. The cubic root of 81846593 is about 434.1770551132.

The spelling of 81846593 in words is "eighty-one million, eight hundred forty-six thousand, five hundred ninety-three".