61550289 has 6 divisors (see below), whose sum is σ = 88905986. Its totient is φ = 41033520.

The previous prime is 61550273. The next prime is 61550297. The reversal of 61550289 is 98205516.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 38192400 + 23357889 = 6180^2 + 4833^2 .

It is not a de Polignac number, because 61550289 - 2⁴ = 61550273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61550249) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419452 + ... + 3419469.

Almost surely, 2^61550289 is an apocalyptic number.

It is an amenable number.

61550289 is a deficient number, since it is larger than the sum of its proper divisors (27355697).

61550289 is a wasteful number, since it uses less digits than its factorization.

61550289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6838927 (or 6838924 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 36.

The square root of 61550289 is about 7845.3992250235. The cubic root of 61550289 is about 394.8298984511.

The spelling of 61550289 in words is "sixty-one million, five hundred fifty thousand, two hundred eighty-nine".