121610399 has 2 divisors, whose sum is σ = 121610400. Its totient is φ = 121610398.

The previous prime is 121610383. The next prime is 121610413. The reversal of 121610399 is 993016121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121610399 - 2⁴ = 121610383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121610329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60805199 + 60805200.

It is an arithmetic number, because the mean of its divisors is an integer number (60805200).

Almost surely, 2^121610399 is an apocalyptic number.

121610399 is a deficient number, since it is larger than the sum of its proper divisors (1).

121610399 is an equidigital number, since it uses as much as digits as its factorization.

121610399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 121610399 is about 11027.7105058122. The cubic root of 121610399 is about 495.4390540478.

The spelling of 121610399 in words is "one hundred twenty-one million, six hundred ten thousand, three hundred ninety-nine".