121078817 has 2 divisors, whose sum is σ = 121078818. Its totient is φ = 121078816.

The previous prime is 121078787. The next prime is 121078843. The reversal of 121078817 is 718870121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119333776 + 1745041 = 10924^2 + 1321^2 .

It is a cyclic number.

It is not a de Polignac number, because 121078817 - 2⁶ = 121078753 is a prime.

It is a super-2 number, since 2×121078817² = 29320159852238978, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121078847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60539408 + 60539409.

It is an arithmetic number, because the mean of its divisors is an integer number (60539409).

Almost surely, 2^121078817 is an apocalyptic number.

It is an amenable number.

121078817 is a deficient number, since it is larger than the sum of its proper divisors (1).

121078817 is an equidigital number, since it uses as much as digits as its factorization.

121078817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6272, while the sum is 35.

The square root of 121078817 is about 11003.5820076919. The cubic root of 121078817 is about 494.7161137907.

The spelling of 121078817 in words is "one hundred twenty-one million, seventy-eight thousand, eight hundred seventeen".