1645131323 has 8 divisors (see below), whose sum is σ = 1804087296. Its totient is φ = 1487741800.

The previous prime is 1645131307. The next prime is 1645131331. The reversal of 1645131323 is 3231315461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1645131323 - 2⁴ = 1645131307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1645131353) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389411 + ... + 393612.

It is an arithmetic number, because the mean of its divisors is an integer number (225510912).

Almost surely, 2^1645131323 is an apocalyptic number.

1645131323 is a deficient number, since it is larger than the sum of its proper divisors (158955973).

1645131323 is a wasteful number, since it uses less digits than its factorization.

1645131323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783225.

The product of its digits is 6480, while the sum is 29.

The square root of 1645131323 is about 40560.2184782084. The cubic root of 1645131323 is about 1180.5023531369.

Adding to 1645131323 its reverse (3231315461), we get a palindrome (4876446784).

It can be divided in two parts, 16451 and 31323, that added together give a palindrome (47774).

The spelling of 1645131323 in words is "one billion, six hundred forty-five million, one hundred thirty-one thousand, three hundred twenty-three".