97555921 has 4 divisors (see below), whose sum is σ = 97727344. Its totient is φ = 97384500.

The previous prime is 97555901. The next prime is 97555957. The reversal of 97555921 is 12955579.

It is a happy number.

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-97555921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97555901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84855 + ... + 85996.

It is an arithmetic number, because the mean of its divisors is an integer number (24431836).

Almost surely, 2^97555921 is an apocalyptic number.

97555921 is the 5280-th centered heptagonal number.

It is an amenable number.

97555921 is a deficient number, since it is larger than the sum of its proper divisors (171423).

97555921 is a wasteful number, since it uses less digits than its factorization.

97555921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171422.

The product of its digits is 141750, while the sum is 43.

The square root of 97555921 is about 9877.0400930643. The cubic root of 97555921 is about 460.3461808093.

The spelling of 97555921 in words is "ninety-seven million, five hundred fifty-five thousand, nine hundred twenty-one".