61611289 has 4 divisors (see below), whose sum is σ = 61694080. Its totient is φ = 61528500.

The previous prime is 61611287. The next prime is 61611293. The reversal of 61611289 is 98211616.

61611289 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61611289 - 2¹ = 61611287 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61611287) 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, 40269 + ... + 41770.

It is an arithmetic number, because the mean of its divisors is an integer number (15423520).

Almost surely, 2^61611289 is an apocalyptic number.

It is an amenable number.

61611289 is a deficient number, since it is larger than the sum of its proper divisors (82791).

61611289 is an equidigital number, since it uses as much as digits as its factorization.

61611289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82790.

The product of its digits is 5184, while the sum is 34.

The square root of 61611289 is about 7849.2858910859. The cubic root of 61611289 is about 394.9602886959.

The spelling of 61611289 in words is "sixty-one million, six hundred eleven thousand, two hundred eighty-nine".