61779189 has 4 divisors (see below), whose sum is σ = 82372256. Its totient is φ = 41186124.

The previous prime is 61779181. The next prime is 61779199. The reversal of 61779189 is 98197716.

It is a happy number.

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 not a de Polignac number, because 61779189 - 2³ = 61779181 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 (61779181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10296529 + ... + 10296534.

It is an arithmetic number, because the mean of its divisors is an integer number (20593064).

Almost surely, 2^61779189 is an apocalyptic number.

It is an amenable number.

61779189 is a deficient number, since it is larger than the sum of its proper divisors (20593067).

61779189 is a wasteful number, since it uses less digits than its factorization.

61779189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20593066.

The product of its digits is 190512, while the sum is 48.

The square root of 61779189 is about 7859.9738549183. The cubic root of 61779189 is about 395.3187386175.

The spelling of 61779189 in words is "sixty-one million, seven hundred seventy-nine thousand, one hundred eighty-nine".