61779937 has 2 divisors, whose sum is σ = 61779938. Its totient is φ = 61779936.

The previous prime is 61779917. The next prime is 61779941. The reversal of 61779937 is 73997716.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53934336 + 7845601 = 7344^2 + 2801^2 .

It is a cyclic number.

It is not a de Polignac number, because 61779937 - 2¹¹ = 61777889 is a prime.

It is not a weakly prime, because it can be changed into another prime (61779917) 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 as a sum of consecutive naturals, namely, 30889968 + 30889969.

It is an arithmetic number, because the mean of its divisors is an integer number (30889969).

Almost surely, 2^61779937 is an apocalyptic number.

It is an amenable number.

61779937 is a deficient number, since it is larger than the sum of its proper divisors (1).

61779937 is an equidigital number, since it uses as much as digits as its factorization.

61779937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 500094, while the sum is 49.

The square root of 61779937 is about 7860.0214376298. The cubic root of 61779937 is about 395.3203340696.

The spelling of 61779937 in words is "sixty-one million, seven hundred seventy-nine thousand, nine hundred thirty-seven".