1645011313 has 16 divisors (see below), whose sum is σ = 1879422336. Its totient is φ = 1425219840.

The previous prime is 1645011299. The next prime is 1645011331. The reversal of 1645011313 is 3131105461.

It is not a de Polignac number, because 1645011313 - 2⁵ = 1645011281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645011343) 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 in 15 ways as a sum of consecutive naturals, for example, 58345 + ... + 81817.

It is an arithmetic number, because the mean of its divisors is an integer number (117463896).

Almost surely, 2^1645011313 is an apocalyptic number.

It is an amenable number.

1645011313 is a deficient number, since it is larger than the sum of its proper divisors (234411023).

1645011313 is a wasteful number, since it uses less digits than its factorization.

1645011313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23784.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1645011313 is about 40558.7390459812. The cubic root of 1645011313 is about 1180.4736471140.

Adding to 1645011313 its reverse (3131105461), we get a palindrome (4776116774).

The spelling of 1645011313 in words is "one billion, six hundred forty-five million, eleven thousand, three hundred thirteen".