1945104509 has 2 divisors, whose sum is σ = 1945104510. Its totient is φ = 1945104508.

The previous prime is 1945104433. The next prime is 1945104571. The reversal of 1945104509 is 9054015491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1331155225 + 613949284 = 36485^2 + 24778^2 .

It is an emirp because it is prime and its reverse (9054015491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1945104509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1945104599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 972552254 + 972552255.

It is an arithmetic number, because the mean of its divisors is an integer number (972552255).

Almost surely, 2^1945104509 is an apocalyptic number.

It is an amenable number.

1945104509 is a deficient number, since it is larger than the sum of its proper divisors (1).

1945104509 is an equidigital number, since it uses as much as digits as its factorization.

1945104509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1945104509 is about 44103.3389779051. The cubic root of 1945104509 is about 1248.2866144410.

The spelling of 1945104509 in words is "one billion, nine hundred forty-five million, one hundred four thousand, five hundred nine".