97776221 has 4 divisors (see below), whose sum is σ = 97893600. Its totient is φ = 97658844.

The previous prime is 97776209. The next prime is 97776227. The reversal of 97776221 is 12267779.

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 97776221 - 2¹⁸ = 97514077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97776227) 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 3 ways as a sum of consecutive naturals, for example, 57431 + ... + 59108.

It is an arithmetic number, because the mean of its divisors is an integer number (24473400).

Almost surely, 2^97776221 is an apocalyptic number.

It is an amenable number.

97776221 is a deficient number, since it is larger than the sum of its proper divisors (117379).

97776221 is a wasteful number, since it uses less digits than its factorization.

97776221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117378.

The product of its digits is 74088, while the sum is 41.

The square root of 97776221 is about 9888.1859306953. The cubic root of 97776221 is about 460.6924369893.

The spelling of 97776221 in words is "ninety-seven million, seven hundred seventy-six thousand, two hundred twenty-one".