61586909 has 2 divisors, whose sum is σ = 61586910. Its totient is φ = 61586908.

The previous prime is 61586887. The next prime is 61586929. The reversal of 61586909 is 90968516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61183684 + 403225 = 7822^2 + 635^2 .

It is a cyclic number.

It is not a de Polignac number, because 61586909 - 2¹² = 61582813 is a prime.

It is a Chen prime.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 61586909.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61586929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30793454 + 30793455.

It is an arithmetic number, because the mean of its divisors is an integer number (30793455).

Almost surely, 2^61586909 is an apocalyptic number.

It is an amenable number.

61586909 is a deficient number, since it is larger than the sum of its proper divisors (1).

61586909 is an equidigital number, since it uses as much as digits as its factorization.

61586909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 61586909 is about 7847.7327299036. The cubic root of 61586909 is about 394.9081856783.

The spelling of 61586909 in words is "sixty-one million, five hundred eighty-six thousand, nine hundred nine".