61920779 has 2 divisors, whose sum is σ = 61920780. Its totient is φ = 61920778.

The previous prime is 61920773. The next prime is 61920787. The reversal of 61920779 is 97702916.

It is a happy number.

61920779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61920779 - 2⁴ = 61920763 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61920773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30960389 + 30960390.

It is an arithmetic number, because the mean of its divisors is an integer number (30960390).

Almost surely, 2^61920779 is an apocalyptic number.

61920779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61920779 is an equidigital number, since it uses as much as digits as its factorization.

61920779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 61920779 is about 7868.9757275010. The cubic root of 61920779 is about 395.6205148539.

The spelling of 61920779 in words is "sixty-one million, nine hundred twenty thousand, seven hundred seventy-nine".