121613381 has 2 divisors, whose sum is σ = 121613382. Its totient is φ = 121613380.

The previous prime is 121613377. The next prime is 121613411. The reversal of 121613381 is 183316121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71132356 + 50481025 = 8434^2 + 7105^2 .

It is a cyclic number.

It is not a de Polignac number, because 121613381 - 2² = 121613377 is a prime.

It is a super-4 number, since 4×121613381⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121613381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121610381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60806690 + 60806691.

It is an arithmetic number, because the mean of its divisors is an integer number (60806691).

Almost surely, 2^121613381 is an apocalyptic number.

It is an amenable number.

121613381 is a deficient number, since it is larger than the sum of its proper divisors (1).

121613381 is an equidigital number, since it uses as much as digits as its factorization.

121613381 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 121613381 is about 11027.8457098383. The cubic root of 121613381 is about 495.4431035567.

The spelling of 121613381 in words is "one hundred twenty-one million, six hundred thirteen thousand, three hundred eighty-one".