61188649 has 4 divisors (see below), whose sum is σ = 61221636. Its totient is φ = 61155664.

The previous prime is 61188629. The next prime is 61188653. The reversal of 61188649 is 94688116.

61188649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4080400 + 57108249 = 2020^2 + 7557^2 .

It is a cyclic number.

It is not a de Polignac number, because 61188649 - 2⁹ = 61188137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61188629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13534 + ... + 17479.

It is an arithmetic number, because the mean of its divisors is an integer number (15305409).

Almost surely, 2^61188649 is an apocalyptic number.

It is an amenable number.

61188649 is a deficient number, since it is larger than the sum of its proper divisors (32987).

61188649 is a wasteful number, since it uses less digits than its factorization.

61188649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32986.

The product of its digits is 82944, while the sum is 43.

The square root of 61188649 is about 7822.3173676347. The cubic root of 61188649 is about 394.0551019330.

The spelling of 61188649 in words is "sixty-one million, one hundred eighty-eight thousand, six hundred forty-nine".