97209729 has 24 divisors (see below), whose sum is σ = 145008864. Its totient is φ = 62712000.

The previous prime is 97209703. The next prime is 97209731. The reversal of 97209729 is 92790279.

It is not a de Polignac number, because 97209729 - 2¹³ = 97201537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (97209779) 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 in 23 ways as a sum of consecutive naturals, for example, 47334 + ... + 49344.

It is an arithmetic number, because the mean of its divisors is an integer number (6042036).

Almost surely, 2^97209729 is an apocalyptic number.

It is an amenable number.

97209729 is a deficient number, since it is larger than the sum of its proper divisors (47799135).

97209729 is a wasteful number, since it uses less digits than its factorization.

97209729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189 (or 2186 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 45.

The square root of 97209729 is about 9859.4994294842. The cubic root of 97209729 is about 459.8009993039.

The spelling of 97209729 in words is "ninety-seven million, two hundred nine thousand, seven hundred twenty-nine".