81207429 has 12 divisors (see below), whose sum is σ = 110988768. Its totient is φ = 52814560.

The previous prime is 81207407. The next prime is 81207431. The reversal of 81207429 is 92470218.

It is a happy number.

It is not a de Polignac number, because 81207429 - 2⁵ = 81207397 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81207429.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81207439) 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 11 ways as a sum of consecutive naturals, for example, 3009 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (9249064).

Almost surely, 2^81207429 is an apocalyptic number.

It is an amenable number.

81207429 is a deficient number, since it is larger than the sum of its proper divisors (29781339).

81207429 is a wasteful number, since it uses less digits than its factorization.

81207429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16188 (or 16147 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 81207429 is about 9011.5164650574. The cubic root of 81207429 is about 433.0438950144.

The spelling of 81207429 in words is "eighty-one million, two hundred seven thousand, four hundred twenty-nine".