1645161339 has 4 divisors (see below), whose sum is σ = 2193548456. Its totient is φ = 1096774224.

The previous prime is 1645161317. The next prime is 1645161347. The reversal of 1645161339 is 9331615461.

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

It is not a de Polignac number, because 1645161339 - 2⁸ = 1645161083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1645161297 and 1645161306.

It is not an unprimeable number, because it can be changed into a prime (1645161359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274193554 + ... + 274193559.

It is an arithmetic number, because the mean of its divisors is an integer number (548387114).

Almost surely, 2^1645161339 is an apocalyptic number.

1645161339 is a deficient number, since it is larger than the sum of its proper divisors (548387117).

1645161339 is an equidigital number, since it uses as much as digits as its factorization.

1645161339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548387116.

The product of its digits is 58320, while the sum is 39.

The square root of 1645161339 is about 40560.5884942514. The cubic root of 1645161339 is about 1180.5095326536.

The spelling of 1645161339 in words is "one billion, six hundred forty-five million, one hundred sixty-one thousand, three hundred thirty-nine".