1645348099 has 4 divisors (see below), whose sum is σ = 1648581120. Its totient is φ = 1642115080.

The previous prime is 1645348069. The next prime is 1645348123. The reversal of 1645348099 is 9908435461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1645348099 - 2¹⁹ = 1644823811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1645348049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1615747 + ... + 1616764.

It is an arithmetic number, because the mean of its divisors is an integer number (412145280).

Almost surely, 2^1645348099 is an apocalyptic number.

1645348099 is a deficient number, since it is larger than the sum of its proper divisors (3233021).

1645348099 is an equidigital number, since it uses as much as digits as its factorization.

1645348099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3233020.

The product of its (nonzero) digits is 933120, while the sum is 49.

The square root of 1645348099 is about 40562.8906637582. The cubic root of 1645348099 is about 1180.5542017513.

The spelling of 1645348099 in words is "one billion, six hundred forty-five million, three hundred forty-eight thousand, ninety-nine".