97628309 has 2 divisors, whose sum is σ = 97628310. Its totient is φ = 97628308.

The previous prime is 97628287. The next prime is 97628347. The reversal of 97628309 is 90382679.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92352100 + 5276209 = 9610^2 + 2297^2 .

It is an emirp because it is prime and its reverse (90382679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97628309 - 2²⁰ = 96579733 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97628309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97628369) 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 as a sum of consecutive naturals, namely, 48814154 + 48814155.

It is an arithmetic number, because the mean of its divisors is an integer number (48814155).

Almost surely, 2^97628309 is an apocalyptic number.

It is an amenable number.

97628309 is a deficient number, since it is larger than the sum of its proper divisors (1).

97628309 is an equidigital number, since it uses as much as digits as its factorization.

97628309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 44.

The square root of 97628309 is about 9880.7038716885. The cubic root of 97628309 is about 460.4600139838.

The spelling of 97628309 in words is "ninety-seven million, six hundred twenty-eight thousand, three hundred nine".