423211561 has 4 divisors (see below), whose sum is σ = 423326932. Its totient is φ = 423096192.

The previous prime is 423211559. The next prime is 423211577. The reversal of 423211561 is 165112324.

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 94478400 + 328733161 = 9720^2 + 18131^2 .

It is a cyclic number.

It is not a de Polignac number, because 423211561 - 2¹ = 423211559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (423211511) 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, 51996 + ... + 59581.

It is an arithmetic number, because the mean of its divisors is an integer number (105831733).

Almost surely, 2^423211561 is an apocalyptic number.

It is an amenable number.

423211561 is a deficient number, since it is larger than the sum of its proper divisors (115371).

423211561 is a wasteful number, since it uses less digits than its factorization.

423211561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115370.

The product of its digits is 1440, while the sum is 25.

The square root of 423211561 is about 20572.1063821865. The cubic root of 423211561 is about 750.7912011889.

Adding to 423211561 its reverse (165112324), we get a palindrome (588323885).

The spelling of 423211561 in words is "four hundred twenty-three million, two hundred eleven thousand, five hundred sixty-one".