61355779 has 2 divisors, whose sum is σ = 61355780. Its totient is φ = 61355778.

The previous prime is 61355759. The next prime is 61355837. The reversal of 61355779 is 97755316.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61355779 - 2⁵ = 61355747 is a prime.

It is not a weakly prime, because it can be changed into another prime (61355729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30677889 + 30677890.

It is an arithmetic number, because the mean of its divisors is an integer number (30677890).

Almost surely, 2^61355779 is an apocalyptic number.

61355779 is a deficient number, since it is larger than the sum of its proper divisors (1).

61355779 is an equidigital number, since it uses as much as digits as its factorization.

61355779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 198450, while the sum is 43.

The square root of 61355779 is about 7832.9929784215. The cubic root of 61355779 is about 394.4135483629.

The spelling of 61355779 in words is "sixty-one million, three hundred fifty-five thousand, seven hundred seventy-nine".