81182723 has 2 divisors, whose sum is σ = 81182724. Its totient is φ = 81182722.

The previous prime is 81182713. The next prime is 81182767. The reversal of 81182723 is 32728118.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81182723 - 2⁸ = 81182467 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81182723.

It is not a weakly prime, because it can be changed into another prime (81182713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40591361 + 40591362.

It is an arithmetic number, because the mean of its divisors is an integer number (40591362).

Almost surely, 2^81182723 is an apocalyptic number.

81182723 is a deficient number, since it is larger than the sum of its proper divisors (1).

81182723 is an equidigital number, since it uses as much as digits as its factorization.

81182723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 81182723 is about 9010.1455593126. The cubic root of 81182723 is about 432.9999751096. Note that the first 4 decimals are identical.

The spelling of 81182723 in words is "eighty-one million, one hundred eighty-two thousand, seven hundred twenty-three".