13223123261 has 2 divisors, whose sum is σ = 13223123262. Its totient is φ = 13223123260.

The previous prime is 13223123257. The next prime is 13223123267. The reversal of 13223123261 is 16232132231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8184820900 + 5038302361 = 90470^2 + 70981^2 .

It is a cyclic number.

It is not a de Polignac number, because 13223123261 - 2² = 13223123257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13223123261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13223123267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6611561630 + 6611561631.

It is an arithmetic number, because the mean of its divisors is an integer number (6611561631).

Almost surely, 2^13223123261 is an apocalyptic number.

It is an amenable number.

13223123261 is a deficient number, since it is larger than the sum of its proper divisors (1).

13223123261 is an equidigital number, since it uses as much as digits as its factorization.

13223123261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 26.

Adding to 13223123261 its reverse (16232132231), we get a palindrome (29455255492).

The spelling of 13223123261 in words is "thirteen billion, two hundred twenty-three million, one hundred twenty-three thousand, two hundred sixty-one".