81051929 has 16 divisors (see below), whose sum is σ = 99504000. Its totient is φ = 65811312.

The previous prime is 81051881. The next prime is 81051953. The reversal of 81051929 is 92915018.

It is not a de Polignac number, because 81051929 - 2⁸ = 81051673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81051959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299 + ... + 12735.

It is an arithmetic number, because the mean of its divisors is an integer number (6219000).

Almost surely, 2^81051929 is an apocalyptic number.

It is an amenable number.

81051929 is a deficient number, since it is larger than the sum of its proper divisors (18452071).

81051929 is a wasteful number, since it uses less digits than its factorization.

81051929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12477 (or 12463 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 81051929 is about 9002.8844822090. The cubic root of 81051929 is about 432.7673137820.

The spelling of 81051929 in words is "eighty-one million, fifty-one thousand, nine hundred twenty-nine".