121435381 has 2 divisors, whose sum is σ = 121435382. Its totient is φ = 121435380.

The previous prime is 121435361. The next prime is 121435417. The reversal of 121435381 is 183534121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108868356 + 12567025 = 10434^2 + 3545^2 .

It is an emirp because it is prime and its reverse (183534121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121435381 - 2⁹ = 121434869 is a prime.

It is a super-2 number, since 2×121435381² = 29493103517230322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121435361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60717690 + 60717691.

It is an arithmetic number, because the mean of its divisors is an integer number (60717691).

Almost surely, 2^121435381 is an apocalyptic number.

It is an amenable number.

121435381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121435381 is an equidigital number, since it uses as much as digits as its factorization.

121435381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 28.

The square root of 121435381 is about 11019.7722753240. The cubic root of 121435381 is about 495.2012663161.

The spelling of 121435381 in words is "one hundred twenty-one million, four hundred thirty-five thousand, three hundred eighty-one".