97979509 has 2 divisors, whose sum is σ = 97979510. Its totient is φ = 97979508.

The previous prime is 97979507. The next prime is 97979533. The reversal of 97979509 is 90597979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 97950609 + 28900 = 9897^2 + 170^2 .

It is a cyclic number.

It is not a de Polignac number, because 97979509 - 2¹ = 97979507 is a prime.

It is a super-3 number, since 3×97979509³ (a number of 25 digits) contains 333 as substring.

Together with 97979507, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 97979509.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97979501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48989754 + 48989755.

It is an arithmetic number, because the mean of its divisors is an integer number (48989755).

Almost surely, 2^97979509 is an apocalyptic number.

It is an amenable number.

97979509 is a deficient number, since it is larger than the sum of its proper divisors (1).

97979509 is an equidigital number, since it uses as much as digits as its factorization.

97979509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1607445, while the sum is 55.

The square root of 97979509 is about 9898.4599307165. The cubic root of 97979509 is about 461.0114934796.

It can be divided in two parts, 9797 and 9509, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 97979509 in words is "ninety-seven million, nine hundred seventy-nine thousand, five hundred nine".