404445131 has 2 divisors, whose sum is σ = 404445132. Its totient is φ = 404445130.

The previous prime is 404445101. The next prime is 404445241. The reversal of 404445131 is 131544404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404445131 is a prime.

It is a super-2 number, since 2×404445131² = 327151727979214322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 404445131.

It is not a weakly prime, because it can be changed into another prime (404445101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202222565 + 202222566.

It is an arithmetic number, because the mean of its divisors is an integer number (202222566).

Almost surely, 2^404445131 is an apocalyptic number.

404445131 is a deficient number, since it is larger than the sum of its proper divisors (1).

404445131 is an equidigital number, since it uses as much as digits as its factorization.

404445131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 404445131 is about 20110.8212413119. The cubic root of 404445131 is about 739.5255852525.

Adding to 404445131 its reverse (131544404), we get a palindrome (535989535).

The spelling of 404445131 in words is "four hundred four million, four hundred forty-five thousand, one hundred thirty-one".