12206431261 has 4 divisors (see below), whose sum is σ = 12258819612. Its totient is φ = 12154042912.

The previous prime is 12206431253. The next prime is 12206431283. The reversal of 12206431261 is 16213460221.

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 2363807161 + 9842624100 = 48619^2 + 99210^2 .

It is a cyclic number.

It is not a de Polignac number, because 12206431261 - 2³ = 12206431253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12206431201) 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, 26193826 + ... + 26194291.

It is an arithmetic number, because the mean of its divisors is an integer number (3064704903).

Almost surely, 2^12206431261 is an apocalyptic number.

It is an amenable number.

12206431261 is a deficient number, since it is larger than the sum of its proper divisors (52388351).

12206431261 is an equidigital number, since it uses as much as digits as its factorization.

12206431261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52388350.

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 12206431261 its reverse (16213460221), we get a palindrome (28419891482).

The spelling of 12206431261 in words is "twelve billion, two hundred six million, four hundred thirty-one thousand, two hundred sixty-one".