97772221 has 8 divisors (see below), whose sum is σ = 98703864. Its totient is φ = 96844800.

The previous prime is 97772201. The next prime is 97772231. The reversal of 97772221 is 12227779.

It can be written as a sum of positive squares in 4 ways, for example, as 14707225 + 83064996 = 3835^2 + 9114^2 .

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 97772221 - 2⁵ = 97772189 is a prime.

It is a Duffinian 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 (97772201) 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, 62181 + ... + 63733.

It is an arithmetic number, because the mean of its divisors is an integer number (12337983).

Almost surely, 2^97772221 is an apocalyptic number.

It is an amenable number.

97772221 is a deficient number, since it is larger than the sum of its proper divisors (931643).

97772221 is a wasteful number, since it uses less digits than its factorization.

97772221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its digits is 24696, while the sum is 37.

The square root of 97772221 is about 9887.9836670577. The cubic root of 97772221 is about 460.6861546340.

The spelling of 97772221 in words is "ninety-seven million, seven hundred seventy-two thousand, two hundred twenty-one".