1645201313 has 6 divisors (see below), whose sum is σ = 1913805666. Its totient is φ = 1410172512.

The previous prime is 1645201277. The next prime is 1645201357. The reversal of 1645201313 is 3131025461.

It can be written as a sum of positive squares in only one way, i.e., 1213268224 + 431933089 = 34832^2 + 20783^2 .

It is not a de Polignac number, because 1645201313 - 2⁸ = 1645201057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1645201373) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16787720 + ... + 16787817.

It is an arithmetic number, because the mean of its divisors is an integer number (318967611).

Almost surely, 2^1645201313 is an apocalyptic number.

It is an amenable number.

1645201313 is a deficient number, since it is larger than the sum of its proper divisors (268604353).

1645201313 is an equidigital number, since it uses as much as digits as its factorization.

1645201313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33575551 (or 33575544 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1645201313 is about 40561.0812602426. The cubic root of 1645201313 is about 1180.5190938852.

Adding to 1645201313 its reverse (3131025461), we get a palindrome (4776226774).

The spelling of 1645201313 in words is "one billion, six hundred forty-five million, two hundred one thousand, three hundred thirteen".