97656821 has 8 divisors (see below), whose sum is σ = 98532000. Its totient is φ = 96786000.

The previous prime is 97656809. The next prime is 97656841. The reversal of 97656821 is 12865679.

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

It is a cyclic number.

It is not a de Polignac number, because 97656821 - 2¹⁸ = 97394677 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 (97656841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56630 + ... + 58328.

It is an arithmetic number, because the mean of its divisors is an integer number (12316500).

Almost surely, 2^97656821 is an apocalyptic number.

It is an amenable number.

97656821 is a deficient number, since it is larger than the sum of its proper divisors (875179).

97656821 is a wasteful number, since it uses less digits than its factorization.

97656821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2179.

The product of its digits is 181440, while the sum is 44.

The square root of 97656821 is about 9882.1465785527. The cubic root of 97656821 is about 460.5048348566.

The spelling of 97656821 in words is "ninety-seven million, six hundred fifty-six thousand, eight hundred twenty-one".