81841629 has 16 divisors (see below), whose sum is σ = 111348864. Its totient is φ = 53457600.

The previous prime is 81841609. The next prime is 81841633. The reversal of 81841629 is 92614818.

It is not a de Polignac number, because 81841629 - 2⁵ = 81841597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81841609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35739 + ... + 37959.

It is an arithmetic number, because the mean of its divisors is an integer number (6959304).

Almost surely, 2^81841629 is an apocalyptic number.

It is an amenable number.

81841629 is a deficient number, since it is larger than the sum of its proper divisors (29507235).

81841629 is a wasteful number, since it uses less digits than its factorization.

81841629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2468.

The product of its digits is 27648, while the sum is 39.

The square root of 81841629 is about 9046.6363362302. The cubic root of 81841629 is about 434.1682773156.

The spelling of 81841629 in words is "eighty-one million, eight hundred forty-one thousand, six hundred twenty-nine".