61998289 has 2 divisors, whose sum is σ = 61998290. Its totient is φ = 61998288.

The previous prime is 61998253. The next prime is 61998301. The reversal of 61998289 is 98289916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43335889 + 18662400 = 6583^2 + 4320^2 .

It is a cyclic number.

It is not a de Polignac number, because 61998289 - 2¹¹ = 61996241 is a prime.

It is not a weakly prime, because it can be changed into another prime (61998589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30999144 + 30999145.

It is an arithmetic number, because the mean of its divisors is an integer number (30999145).

Almost surely, 2^61998289 is an apocalyptic number.

It is an amenable number.

61998289 is a deficient number, since it is larger than the sum of its proper divisors (1).

61998289 is an equidigital number, since it uses as much as digits as its factorization.

61998289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 52.

The square root of 61998289 is about 7873.8992246536. The cubic root of 61998289 is about 395.7855200998.

The spelling of 61998289 in words is "sixty-one million, nine hundred ninety-eight thousand, two hundred eighty-nine".