2145504409 has 2 divisors, whose sum is σ = 2145504410. Its totient is φ = 2145504408.

The previous prime is 2145504367. The next prime is 2145504437. The reversal of 2145504409 is 9044055412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2143690000 + 1814409 = 46300^2 + 1347^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145504409 - 2⁷ = 2145504281 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145504209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072752204 + 1072752205.

It is an arithmetic number, because the mean of its divisors is an integer number (1072752205).

Almost surely, 2^2145504409 is an apocalyptic number.

It is an amenable number.

2145504409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145504409 is an equidigital number, since it uses as much as digits as its factorization.

2145504409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 2145504409 is about 46319.5899053521. The cubic root of 2145504409 is about 1289.7626727237.

The spelling of 2145504409 in words is "two billion, one hundred forty-five million, five hundred four thousand, four hundred nine".