61961779 has 4 divisors (see below), whose sum is σ = 67594680. Its totient is φ = 56328880.

The previous prime is 61961773. The next prime is 61961789. The reversal of 61961779 is 97716916.

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 61961779 - 2⁹ = 61961267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61961773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2816434 + ... + 2816455.

It is an arithmetic number, because the mean of its divisors is an integer number (16898670).

Almost surely, 2^61961779 is an apocalyptic number.

61961779 is a deficient number, since it is larger than the sum of its proper divisors (5632901).

61961779 is a wasteful number, since it uses less digits than its factorization.

61961779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5632900.

The product of its digits is 142884, while the sum is 46.

The square root of 61961779 is about 7871.5804639221. The cubic root of 61961779 is about 395.7078138330.

The spelling of 61961779 in words is "sixty-one million, nine hundred sixty-one thousand, seven hundred seventy-nine".