1645199513 has 2 divisors, whose sum is σ = 1645199514. Its totient is φ = 1645199512.

The previous prime is 1645199503. The next prime is 1645199519. The reversal of 1645199513 is 3159915461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1621511824 + 23687689 = 40268^2 + 4867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645199513 - 2⁶ = 1645199449 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1645199519) 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, 822599756 + 822599757.

It is an arithmetic number, because the mean of its divisors is an integer number (822599757).

Almost surely, 2^1645199513 is an apocalyptic number.

It is an amenable number.

1645199513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645199513 is an equidigital number, since it uses as much as digits as its factorization.

1645199513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 1645199513 is about 40561.0590714789. The cubic root of 1645199513 is about 1180.5186633532.

The spelling of 1645199513 in words is "one billion, six hundred forty-five million, one hundred ninety-nine thousand, five hundred thirteen".