61868399 has 2 divisors, whose sum is σ = 61868400. Its totient is φ = 61868398.

The previous prime is 61868393. The next prime is 61868407. The reversal of 61868399 is 99386816.

61868399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61868399 - 2⁸ = 61868143 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61868393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30934199 + 30934200.

It is an arithmetic number, because the mean of its divisors is an integer number (30934200).

Almost surely, 2^61868399 is an apocalyptic number.

61868399 is a deficient number, since it is larger than the sum of its proper divisors (1).

61868399 is an equidigital number, since it uses as much as digits as its factorization.

61868399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 50.

The square root of 61868399 is about 7865.6467629814. The cubic root of 61868399 is about 395.5089290025.

The spelling of 61868399 in words is "sixty-one million, eight hundred sixty-eight thousand, three hundred ninety-nine".