81829207 has 2 divisors, whose sum is σ = 81829208. Its totient is φ = 81829206.

The previous prime is 81829159. The next prime is 81829217. The reversal of 81829207 is 70292818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81829207 - 2¹⁵ = 81796439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81829217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40914603 + 40914604.

It is an arithmetic number, because the mean of its divisors is an integer number (40914604).

Almost surely, 2^81829207 is an apocalyptic number.

81829207 is a deficient number, since it is larger than the sum of its proper divisors (1).

81829207 is an equidigital number, since it uses as much as digits as its factorization.

81829207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 81829207 is about 9045.9497566591. The cubic root of 81829207 is about 434.1463100466.

The spelling of 81829207 in words is "eighty-one million, eight hundred twenty-nine thousand, two hundred seven".