81654323 has 2 divisors, whose sum is σ = 81654324. Its totient is φ = 81654322.

The previous prime is 81654319. The next prime is 81654371. The reversal of 81654323 is 32345618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81654323 - 2² = 81654319 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 81654323.

It is not a weakly prime, because it can be changed into another prime (81654823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40827161 + 40827162.

It is an arithmetic number, because the mean of its divisors is an integer number (40827162).

Almost surely, 2^81654323 is an apocalyptic number.

81654323 is a deficient number, since it is larger than the sum of its proper divisors (1).

81654323 is an equidigital number, since it uses as much as digits as its factorization.

81654323 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 32.

The square root of 81654323 is about 9036.2781608359. The cubic root of 81654323 is about 433.8368060643.

The spelling of 81654323 in words is "eighty-one million, six hundred fifty-four thousand, three hundred twenty-three".