61284989 has 2 divisors, whose sum is σ = 61284990. Its totient is φ = 61284988.

The previous prime is 61284953. The next prime is 61284997. The reversal of 61284989 is 98948216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39476089 + 21808900 = 6283^2 + 4670^2 .

It is a cyclic number.

It is not a de Polignac number, because 61284989 - 2⁸ = 61284733 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 (61284919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30642494 + 30642495.

It is an arithmetic number, because the mean of its divisors is an integer number (30642495).

Almost surely, 2^61284989 is an apocalyptic number.

It is an amenable number.

61284989 is a deficient number, since it is larger than the sum of its proper divisors (1).

61284989 is an equidigital number, since it uses as much as digits as its factorization.

61284989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 47.

The square root of 61284989 is about 7828.4729673162. The cubic root of 61284989 is about 394.2618034617.

The spelling of 61284989 in words is "sixty-one million, two hundred eighty-four thousand, nine hundred eighty-nine".