97656621 has 4 divisors (see below), whose sum is σ = 130208832. Its totient is φ = 65104412.

The previous prime is 97656617. The next prime is 97656631. The reversal of 97656621 is 12665679.

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 not a de Polignac number, because 97656621 - 2² = 97656617 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97656631) 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, 16276101 + ... + 16276106.

It is an arithmetic number, because the mean of its divisors is an integer number (32552208).

Almost surely, 2^97656621 is an apocalyptic number.

It is an amenable number.

97656621 is a deficient number, since it is larger than the sum of its proper divisors (32552211).

97656621 is a wasteful number, since it uses less digits than its factorization.

97656621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32552210.

The product of its digits is 136080, while the sum is 42.

The square root of 97656621 is about 9882.1364592885. The cubic root of 97656621 is about 460.5045204869.

The spelling of 97656621 in words is "ninety-seven million, six hundred fifty-six thousand, six hundred twenty-one".