121280917 has 2 divisors, whose sum is σ = 121280918. Its totient is φ = 121280916.

The previous prime is 121280893. The next prime is 121280963. The reversal of 121280917 is 719082121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119224561 + 2056356 = 10919^2 + 1434^2 .

It is a cyclic number.

It is not a de Polignac number, because 121280917 - 2²³ = 112892309 is a prime.

It is equal to p_6910438 and since 121280917 and 6910438 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121280977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60640458 + 60640459.

It is an arithmetic number, because the mean of its divisors is an integer number (60640459).

Almost surely, 2^121280917 is an apocalyptic number.

It is an amenable number.

121280917 is a deficient number, since it is larger than the sum of its proper divisors (1).

121280917 is an equidigital number, since it uses as much as digits as its factorization.

121280917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 121280917 is about 11012.7615519451. The cubic root of 121280917 is about 494.9912143460.

The spelling of 121280917 in words is "one hundred twenty-one million, two hundred eighty thousand, nine hundred seventeen".