61889689 has 3 divisors (see below), whose sum is σ = 61897557. Its totient is φ = 61881822.

The previous prime is 61889687. The next prime is 61889701. The reversal of 61889689 is 98698816.

The square root of 61889689 is 7867.

It is a perfect power (a square), and thus also a powerful number.

61889689 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 brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 61889689 - 2¹ = 61889687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61889687) 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 2 ways as a sum of consecutive naturals, for example, 3934 + ... + 11800.

It is an arithmetic number, because the mean of its divisors is an integer number (20632519).

Almost surely, 2^61889689 is an apocalyptic number.

61889689 is the 7867-th square number.

61889689 is the 3934-th centered octagonal number.

It is an amenable number.

61889689 is a deficient number, since it is larger than the sum of its proper divisors (7868).

61889689 is an frugal number, since it uses more digits than its factorization.

61889689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15734 (or 7867 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 55.

The cubic root of 61889689 is about 395.5542909835.

The spelling of 61889689 in words is "sixty-one million, eight hundred eighty-nine thousand, six hundred eighty-nine".