61890779 has 2 divisors, whose sum is σ = 61890780. Its totient is φ = 61890778.

The previous prime is 61890757. The next prime is 61890793. The reversal of 61890779 is 97709816.

61890779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61890779 - 2¹² = 61886683 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61890799) 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, 30945389 + 30945390.

It is an arithmetic number, because the mean of its divisors is an integer number (30945390).

Almost surely, 2^61890779 is an apocalyptic number.

61890779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61890779 is an equidigital number, since it uses as much as digits as its factorization.

61890779 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 61890779 is about 7867.0692764205. The cubic root of 61890779 is about 395.5566131347.

The spelling of 61890779 in words is "sixty-one million, eight hundred ninety thousand, seven hundred seventy-nine".