61780319 has 2 divisors, whose sum is σ = 61780320. Its totient is φ = 61780318.

The previous prime is 61780309. The next prime is 61780331. The reversal of 61780319 is 91308716.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61780319 - 2¹² = 61776223 is a prime.

It is a super-2 number, since 2×61780319² = 7633615631483522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61780309) 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, 30890159 + 30890160.

It is an arithmetic number, because the mean of its divisors is an integer number (30890160).

Almost surely, 2^61780319 is an apocalyptic number.

61780319 is a deficient number, since it is larger than the sum of its proper divisors (1).

61780319 is an equidigital number, since it uses as much as digits as its factorization.

61780319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 61780319 is about 7860.0457377804. The cubic root of 61780319 is about 395.3211488544.

The spelling of 61780319 in words is "sixty-one million, seven hundred eighty thousand, three hundred nineteen".