81829723 has 2 divisors, whose sum is σ = 81829724. Its totient is φ = 81829722.

The previous prime is 81829697. The next prime is 81829753. The reversal of 81829723 is 32792818.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81829723 - 2⁵ = 81829691 is a prime.

It is a super-2 number, since 2×81829723² = 13392207132513458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (81829753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40914861 + 40914862.

It is an arithmetic number, because the mean of its divisors is an integer number (40914862).

Almost surely, 2^81829723 is an apocalyptic number.

81829723 is a deficient number, since it is larger than the sum of its proper divisors (1).

81829723 is an equidigital number, since it uses as much as digits as its factorization.

81829723 is an odious number, because the sum of its binary digits is odd.

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

The square root of 81829723 is about 9045.9782776657. The cubic root of 81829723 is about 434.1472225938.

The spelling of 81829723 in words is "eighty-one million, eight hundred twenty-nine thousand, seven hundred twenty-three".