445131321 has 16 divisors (see below), whose sum is σ = 599531520. Its totient is φ = 293757840.

The previous prime is 445131311. The next prime is 445131343. The reversal of 445131321 is 123131544.

It is a happy number.

It is not a de Polignac number, because 445131321 - 2¹⁰ = 445130297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 445131291 and 445131300.

It is not an unprimeable number, because it can be changed into a prime (445131311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130840 + ... + 134198.

It is an arithmetic number, because the mean of its divisors is an integer number (37470720).

Almost surely, 2^445131321 is an apocalyptic number.

It is an amenable number.

445131321 is a deficient number, since it is larger than the sum of its proper divisors (154400199).

445131321 is a wasteful number, since it uses less digits than its factorization.

445131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3796.

The product of its digits is 1440, while the sum is 24.

The square root of 445131321 is about 21098.1354863410. The cubic root of 445131321 is about 763.5357647023.

Adding to 445131321 its reverse (123131544), we get a palindrome (568262865).

The spelling of 445131321 in words is "four hundred forty-five million, one hundred thirty-one thousand, three hundred twenty-one".