81829159 has 2 divisors, whose sum is σ = 81829160. Its totient is φ = 81829158.

The previous prime is 81829087. The next prime is 81829207. The reversal of 81829159 is 95192818.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81829159 - 2¹³ = 81820967 is a prime.

It is a super-2 number, since 2×81829159² = 13392022525294562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81829259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40914579 + 40914580.

It is an arithmetic number, because the mean of its divisors is an integer number (40914580).

Almost surely, 2^81829159 is an apocalyptic number.

81829159 is a deficient number, since it is larger than the sum of its proper divisors (1).

81829159 is an equidigital number, since it uses as much as digits as its factorization.

81829159 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 43.

The square root of 81829159 is about 9045.9471035376. The cubic root of 81829159 is about 434.1462251583.

The spelling of 81829159 in words is "eighty-one million, eight hundred twenty-nine thousand, one hundred fifty-nine".