61645411 has 4 divisors (see below), whose sum is σ = 61696800. Its totient is φ = 61594024.

The previous prime is 61645399. The next prime is 61645421. The reversal of 61645411 is 11454616.

61645411 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 is a cyclic number.

It is not a de Polignac number, because 61645411 - 2⁵ = 61645379 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61645411.

It is not an unprimeable number, because it can be changed into a prime (61645421) 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, 23851 + ... + 26308.

It is an arithmetic number, because the mean of its divisors is an integer number (15424200).

Almost surely, 2^61645411 is an apocalyptic number.

61645411 is a deficient number, since it is larger than the sum of its proper divisors (51389).

61645411 is a wasteful number, since it uses less digits than its factorization.

61645411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51388.

The product of its digits is 2880, while the sum is 28.

The square root of 61645411 is about 7851.4591637478. The cubic root of 61645411 is about 395.0331884735.

The spelling of 61645411 in words is "sixty-one million, six hundred forty-five thousand, four hundred eleven".