121361381 has 2 divisors, whose sum is σ = 121361382. Its totient is φ = 121361380.

The previous prime is 121361347. The next prime is 121361399. The reversal of 121361381 is 183163121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119552356 + 1809025 = 10934^2 + 1345^2 .

It is a cyclic number.

It is not a de Polignac number, because 121361381 - 2¹⁰ = 121360357 is a prime.

It is a super-2 number, since 2×121361381² = 29457169596454322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121361381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121361281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60680690 + 60680691.

It is an arithmetic number, because the mean of its divisors is an integer number (60680691).

Almost surely, 2^121361381 is an apocalyptic number.

It is an amenable number.

121361381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121361381 is an equidigital number, since it uses as much as digits as its factorization.

121361381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 121361381 is about 11016.4141625122. The cubic root of 121361381 is about 495.1006576921.

The spelling of 121361381 in words is "one hundred twenty-one million, three hundred sixty-one thousand, three hundred eighty-one".