97778121 has 16 divisors (see below), whose sum is σ = 150000000. Its totient is φ = 55496448.

The previous prime is 97778119. The next prime is 97778137. The reversal of 97778121 is 12187779.

It is not a de Polignac number, because 97778121 - 2¹ = 97778119 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97778521) 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 15 ways as a sum of consecutive naturals, for example, 12496 + ... + 18753.

It is an arithmetic number, because the mean of its divisors is an integer number (9375000).

Almost surely, 2^97778121 is an apocalyptic number.

It is an amenable number.

97778121 is a deficient number, since it is larger than the sum of its proper divisors (52221879).

97778121 is a wasteful number, since it uses less digits than its factorization.

97778121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31408.

The product of its digits is 49392, while the sum is 42.

The square root of 97778121 is about 9888.2820044738. The cubic root of 97778121 is about 460.6954210480.

The spelling of 97778121 in words is "ninety-seven million, seven hundred seventy-eight thousand, one hundred twenty-one".