61885189 has 4 divisors (see below), whose sum is σ = 62155660. Its totient is φ = 61614720.

The previous prime is 61885177. The next prime is 61885193. The reversal of 61885189 is 98158816.

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 43890625 + 17994564 = 6625^2 + 4242^2 .

It is a cyclic number.

It is not a de Polignac number, because 61885189 - 2⁹ = 61884677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61885129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134892 + ... + 135349.

It is an arithmetic number, because the mean of its divisors is an integer number (15538915).

Almost surely, 2^61885189 is an apocalyptic number.

It is an amenable number.

61885189 is a deficient number, since it is larger than the sum of its proper divisors (270471).

61885189 is a wasteful number, since it uses less digits than its factorization.

61885189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270470.

The product of its digits is 138240, while the sum is 46.

The square root of 61885189 is about 7866.7139899707. The cubic root of 61885189 is about 395.5447038321.

The spelling of 61885189 in words is "sixty-one million, eight hundred eighty-five thousand, one hundred eighty-nine".