121001281 has 2 divisors, whose sum is σ = 121001282. Its totient is φ = 121001280.

The previous prime is 121001273. The next prime is 121001297. The reversal of 121001281 is 182100121.

It is an a-pointer prime, because the next prime (121001297) can be obtained adding 121001281 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107744400 + 13256881 = 10380^2 + 3641^2 .

It is a cyclic number.

It is not a de Polignac number, because 121001281 - 2³ = 121001273 is a prime.

It is a super-2 number, since 2×121001281² = 29282620007281922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121001681) 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, 60500640 + 60500641.

It is an arithmetic number, because the mean of its divisors is an integer number (60500641).

Almost surely, 2^121001281 is an apocalyptic number.

It is an amenable number.

121001281 is a deficient number, since it is larger than the sum of its proper divisors (1).

121001281 is an equidigital number, since it uses as much as digits as its factorization.

121001281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 121001281 is about 11000.0582271186. The cubic root of 121001281 is about 494.6104897562.

The spelling of 121001281 in words is "one hundred twenty-one million, one thousand, two hundred eighty-one".