97218499539 has 24 divisors (see below), whose sum is σ = 159657756048. Its totient is φ = 52285578240.

The previous prime is 97218499517. The next prime is 97218499541. The reversal of 97218499539 is 93599481279.

It is not a de Polignac number, because 97218499539 - 2¹¹ = 97218497491 is a prime.

It is a super-2 number, since 2×97218499539² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 97218499539.

It is not an unprimeable number, because it can be changed into a prime (97218499039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19448982 + ... + 19453979.

It is an arithmetic number, because the mean of its divisors is an integer number (6652406502).

Almost surely, 2^97218499539 is an apocalyptic number.

97218499539 is a deficient number, since it is larger than the sum of its proper divisors (62439256509).

97218499539 is a wasteful number, since it uses less digits than its factorization.

97218499539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38902995 (or 38902988 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 66.

The spelling of 97218499539 in words is "ninety-seven billion, two hundred eighteen million, four hundred ninety-nine thousand, five hundred thirty-nine".