121285811 has 2 divisors, whose sum is σ = 121285812. Its totient is φ = 121285810.

The previous prime is 121285807. The next prime is 121285817. The reversal of 121285811 is 118582121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121285811 - 2² = 121285807 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121285817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60642905 + 60642906.

It is an arithmetic number, because the mean of its divisors is an integer number (60642906).

Almost surely, 2^121285811 is an apocalyptic number.

121285811 is a deficient number, since it is larger than the sum of its proper divisors (1).

121285811 is an equidigital number, since it uses as much as digits as its factorization.

121285811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1280, while the sum is 29.

The square root of 121285811 is about 11012.9837464694. The cubic root of 121285811 is about 494.9978723168.

The spelling of 121285811 in words is "one hundred twenty-one million, two hundred eighty-five thousand, eight hundred eleven".