61649109 has 12 divisors (see below), whose sum is σ = 89282700. Its totient is φ = 40991424.

The previous prime is 61649083. The next prime is 61649149. The reversal of 61649109 is 90194616.

61649109 is a `hidden beast` number, since 6 + 1 + 649 + 1 + 0 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30008484 + 31640625 = 5478^2 + 5625^2 .

It is not a de Polignac number, because 61649109 - 2⁷ = 61648981 is a prime.

It is a super-2 number, since 2×61649109² = 7601225280987762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649149) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5304 + ... + 12305.

It is an arithmetic number, because the mean of its divisors is an integer number (7440225).

Almost surely, 2^61649109 is an apocalyptic number.

It is an amenable number.

61649109 is a deficient number, since it is larger than the sum of its proper divisors (27633591).

61649109 is a wasteful number, since it uses less digits than its factorization.

61649109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18004 (or 18001 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 61649109 is about 7851.6946578430. The cubic root of 61649109 is about 395.0410874314.

The spelling of 61649109 in words is "sixty-one million, six hundred forty-nine thousand, one hundred nine".