121289381 has 2 divisors, whose sum is σ = 121289382. Its totient is φ = 121289380.

The previous prime is 121289353. The next prime is 121289383. The reversal of 121289381 is 183982121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111492481 + 9796900 = 10559^2 + 3130^2 .

It is a cyclic number.

It is not a de Polignac number, because 121289381 - 2⁶ = 121289317 is a prime.

It is a super-2 number, since 2×121289381² = 29422227886726322, which contains 22 as substring.

Together with 121289383, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121289383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60644690 + 60644691.

It is an arithmetic number, because the mean of its divisors is an integer number (60644691).

Almost surely, 2^121289381 is an apocalyptic number.

It is an amenable number.

121289381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121289381 is an equidigital number, since it uses as much as digits as its factorization.

121289381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6912, while the sum is 35.

The square root of 121289381 is about 11013.1458266928. The cubic root of 121289381 is about 495.0027289582.

The spelling of 121289381 in words is "one hundred twenty-one million, two hundred eighty-nine thousand, three hundred eighty-one".