61961785 has 4 divisors (see below), whose sum is σ = 74354148. Its totient is φ = 49569424.

The previous prime is 61961773. The next prime is 61961789. The reversal of 61961785 is 58716916.

It is a happy number.

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 25431849 + 36529936 = 5043^2 + 6044^2 .

It is a cyclic number.

It is not a de Polignac number, because 61961785 - 2⁷ = 61961657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61961789) 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, 6196174 + ... + 6196183.

It is an arithmetic number, because the mean of its divisors is an integer number (18588537).

Almost surely, 2^61961785 is an apocalyptic number.

It is an amenable number.

61961785 is a deficient number, since it is larger than the sum of its proper divisors (12392363).

61961785 is a wasteful number, since it uses less digits than its factorization.

61961785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12392362.

The product of its digits is 90720, while the sum is 43.

The square root of 61961785 is about 7871.5808450400. The cubic root of 61961785 is about 395.7078266056.

The spelling of 61961785 in words is "sixty-one million, nine hundred sixty-one thousand, seven hundred eighty-five".