121361289 has 32 divisors (see below), whose sum is σ = 192000000. Its totient is φ = 68139792.

The previous prime is 121361287. The next prime is 121361329. The reversal of 121361289 is 982163121.

It is not a de Polignac number, because 121361289 - 2¹ = 121361287 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121361281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59712 + ... + 61710.

It is an arithmetic number, because the mean of its divisors is an integer number (6000000).

Almost surely, 2^121361289 is an apocalyptic number.

It is an amenable number.

121361289 is a deficient number, since it is larger than the sum of its proper divisors (70638711).

121361289 is an equidigital number, since it uses as much as digits as its factorization.

121361289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2082 (or 2068 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 121361289 is about 11016.4099869241. The cubic root of 121361289 is about 495.1005325856.

The spelling of 121361289 in words is "one hundred twenty-one million, three hundred sixty-one thousand, two hundred eighty-nine".