19780141 has 2 divisors, whose sum is σ = 19780142. Its totient is φ = 19780140.

The previous prime is 19780109. The next prime is 19780157. The reversal of 19780141 is 14108791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19766916 + 13225 = 4446^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 19780141 - 2⁵ = 19780109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19780171) 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, 9890070 + 9890071.

It is an arithmetic number, because the mean of its divisors is an integer number (9890071).

Almost surely, 2^19780141 is an apocalyptic number.

It is an amenable number.

19780141 is a deficient number, since it is larger than the sum of its proper divisors (1).

19780141 is an equidigital number, since it uses as much as digits as its factorization.

19780141 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 19780141 is about 4447.4870432639. The cubic root of 19780141 is about 270.4434459575.

The spelling of 19780141 in words is "nineteen million, seven hundred eighty thousand, one hundred forty-one".