97972609821 has 8 divisors (see below), whose sum is σ = 130678736640. Its totient is φ = 65290778112.

The previous prime is 97972609817. The next prime is 97972609837. The reversal of 97972609821 is 12890627979.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 97972609821 - 2² = 97972609817 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97972609421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6064365 + ... + 6080498.

It is an arithmetic number, because the mean of its divisors is an integer number (16334842080).

Almost surely, 2^97972609821 is an apocalyptic number.

It is an amenable number.

97972609821 is a deficient number, since it is larger than the sum of its proper divisors (32706126819).

97972609821 is a wasteful number, since it uses less digits than its factorization.

97972609821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12147555.

The product of its (nonzero) digits is 6858432, while the sum is 60.

The spelling of 97972609821 in words is "ninety-seven billion, nine hundred seventy-two million, six hundred nine thousand, eight hundred twenty-one".