61858289 has 2 divisors, whose sum is σ = 61858290. Its totient is φ = 61858288.

The previous prime is 61858267. The next prime is 61858297. The reversal of 61858289 is 98285816.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 64 = 7865^2 + 8^2 .

It is a cyclic number.

It is not a de Polignac number, because 61858289 - 2⁸ = 61858033 is a prime.

It is not a weakly prime, because it can be changed into another prime (61858259) 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, 30929144 + 30929145.

It is an arithmetic number, because the mean of its divisors is an integer number (30929145).

Almost surely, 2^61858289 is an apocalyptic number.

It is an amenable number.

61858289 is a deficient number, since it is larger than the sum of its proper divisors (1).

61858289 is an equidigital number, since it uses as much as digits as its factorization.

61858289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 276480, while the sum is 47.

The square root of 61858289 is about 7865.0040686576. The cubic root of 61858289 is about 395.4873842766.

The spelling of 61858289 in words is "sixty-one million, eight hundred fifty-eight thousand, two hundred eighty-nine".