1954500209 has 2 divisors, whose sum is σ = 1954500210. Its totient is φ = 1954500208.

The previous prime is 1954500203. The next prime is 1954500241. The reversal of 1954500209 is 9020054591.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1868659984 + 85840225 = 43228^2 + 9265^2 .

It is an emirp because it is prime and its reverse (9020054591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1954500209 - 2²⁴ = 1937722993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1954500203) 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, 977250104 + 977250105.

It is an arithmetic number, because the mean of its divisors is an integer number (977250105).

Almost surely, 2^1954500209 is an apocalyptic number.

It is an amenable number.

1954500209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1954500209 is an equidigital number, since it uses as much as digits as its factorization.

1954500209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 1954500209 is about 44209.7298001243. The cubic root of 1954500209 is about 1250.2933090904.

The spelling of 1954500209 in words is "one billion, nine hundred fifty-four million, five hundred thousand, two hundred nine".