61868533 has 2 divisors, whose sum is σ = 61868534. Its totient is φ = 61868532.

The previous prime is 61868531. The next prime is 61868557. The reversal of 61868533 is 33586816.

61868533 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 can be written as a sum of positive squares in only one way, i.e., 38229489 + 23639044 = 6183^2 + 4862^2 .

It is a cyclic number.

It is not a de Polignac number, because 61868533 - 2¹ = 61868531 is a prime.

Together with 61868531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61868531) 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, 30934266 + 30934267.

It is an arithmetic number, because the mean of its divisors is an integer number (30934267).

Almost surely, 2^61868533 is an apocalyptic number.

It is an amenable number.

61868533 is a deficient number, since it is larger than the sum of its proper divisors (1).

61868533 is an equidigital number, since it uses as much as digits as its factorization.

61868533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The square root of 61868533 is about 7865.6552810303. The cubic root of 61868533 is about 395.5092145449.

The spelling of 61868533 in words is "sixty-one million, eight hundred sixty-eight thousand, five hundred thirty-three".