97980509 has 4 divisors (see below), whose sum is σ = 106887840. Its totient is φ = 89073180.

The previous prime is 97980499. The next prime is 97980521. The reversal of 97980509 is 90508979.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97980509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97980409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4453649 + ... + 4453670.

It is an arithmetic number, because the mean of its divisors is an integer number (26721960).

Almost surely, 2^97980509 is an apocalyptic number.

It is an amenable number.

97980509 is a deficient number, since it is larger than the sum of its proper divisors (8907331).

97980509 is a wasteful number, since it uses less digits than its factorization.

97980509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8907330.

The product of its (nonzero) digits is 204120, while the sum is 47.

The square root of 97980509 is about 9898.5104434960. The cubic root of 97980509 is about 461.0130618685.

It can be divided in two parts, 97980 and 509, that added together give a palindrome (98489).

The spelling of 97980509 in words is "ninety-seven million, nine hundred eighty thousand, five hundred nine".