423511645 has 4 divisors (see below), whose sum is σ = 508213980. Its totient is φ = 338809312.

The previous prime is 423511643. The next prime is 423511651. The reversal of 423511645 is 546115324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 276689956 + 146821689 = 16634^2 + 12117^2 .

It is a cyclic number.

It is not a de Polignac number, because 423511645 - 2¹ = 423511643 is a prime.

It is a super-2 number, since 2×423511645² = 358724226901212050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423511643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42351160 + ... + 42351169.

It is an arithmetic number, because the mean of its divisors is an integer number (127053495).

Almost surely, 2^423511645 is an apocalyptic number.

It is an amenable number.

423511645 is a deficient number, since it is larger than the sum of its proper divisors (84702335).

423511645 is an equidigital number, since it uses as much as digits as its factorization.

423511645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84702334.

The product of its digits is 14400, while the sum is 31.

The square root of 423511645 is about 20579.3985577810. The cubic root of 423511645 is about 750.9686122190.

Adding to 423511645 its reverse (546115324), we get a palindrome (969626969).

The spelling of 423511645 in words is "four hundred twenty-three million, five hundred eleven thousand, six hundred forty-five".