121390169 has 2 divisors, whose sum is σ = 121390170. Its totient is φ = 121390168.

The previous prime is 121390153. The next prime is 121390177. The reversal of 121390169 is 961093121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121264144 + 126025 = 11012^2 + 355^2 .

It is a cyclic number.

It is not a de Polignac number, because 121390169 - 2⁴ = 121390153 is a prime.

It is a super-2 number, since 2×121390169² = 29471146259697122, which contains 22 as substring.

It is equal to p_6916271 and since 121390169 and 6916271 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (121390189) 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 as a sum of consecutive naturals, namely, 60695084 + 60695085.

It is an arithmetic number, because the mean of its divisors is an integer number (60695085).

Almost surely, 2^121390169 is an apocalyptic number.

It is an amenable number.

121390169 is a deficient number, since it is larger than the sum of its proper divisors (1).

121390169 is an equidigital number, since it uses as much as digits as its factorization.

121390169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 121390169 is about 11017.7206807942. The cubic root of 121390169 is about 495.1398020250.

The spelling of 121390169 in words is "one hundred twenty-one million, three hundred ninety thousand, one hundred sixty-nine".