61843289 has 2 divisors, whose sum is σ = 61843290. Its totient is φ = 61843288.

The previous prime is 61843277. The next prime is 61843291. The reversal of 61843289 is 98234816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35010889 + 26832400 = 5917^2 + 5180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61843289 is a prime.

It is a Sophie Germain prime.

Together with 61843291, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (61843219) 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, 30921644 + 30921645.

It is an arithmetic number, because the mean of its divisors is an integer number (30921645).

Almost surely, 2^61843289 is an apocalyptic number.

It is an amenable number.

61843289 is a deficient number, since it is larger than the sum of its proper divisors (1).

61843289 is an equidigital number, since it uses as much as digits as its factorization.

61843289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 41.

The square root of 61843289 is about 7864.0504194721. The cubic root of 61843289 is about 395.4554144822.

The spelling of 61843289 in words is "sixty-one million, eight hundred forty-three thousand, two hundred eighty-nine".