97725509 has 16 divisors (see below), whose sum is σ = 115167360. Its totient is φ = 81181440.

The previous prime is 97725499. The next prime is 97725553. The reversal of 97725509 is 90552779.

It is a cyclic number.

It is not a de Polignac number, because 97725509 - 2⁸ = 97725253 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 97725509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97725109) 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 15 ways as a sum of consecutive naturals, for example, 45737 + ... + 47825.

It is an arithmetic number, because the mean of its divisors is an integer number (7197960).

Almost surely, 2^97725509 is an apocalyptic number.

It is an amenable number.

97725509 is a deficient number, since it is larger than the sum of its proper divisors (17441851).

97725509 is a wasteful number, since it uses less digits than its factorization.

97725509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300.

The product of its (nonzero) digits is 198450, while the sum is 44.

The square root of 97725509 is about 9885.6213259461. The cubic root of 97725509 is about 460.6127766014.

The spelling of 97725509 in words is "ninety-seven million, seven hundred twenty-five thousand, five hundred nine".