1780542109 has 2 divisors, whose sum is σ = 1780542110. Its totient is φ = 1780542108.

The previous prime is 1780542067. The next prime is 1780542119. The reversal of 1780542109 is 9012450871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1757454084 + 23088025 = 41922^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 1780542109 - 2¹¹ = 1780540061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1780542119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 890271054 + 890271055.

It is an arithmetic number, because the mean of its divisors is an integer number (890271055).

Almost surely, 2^1780542109 is an apocalyptic number.

It is an amenable number.

1780542109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1780542109 is an equidigital number, since it uses as much as digits as its factorization.

1780542109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1780542109 is about 42196.4703381693. The cubic root of 1780542109 is about 1212.0412937911.

The spelling of 1780542109 in words is "one billion, seven hundred eighty million, five hundred forty-two thousand, one hundred nine".