111201223261 has 2 divisors, whose sum is σ = 111201223262. Its totient is φ = 111201223260.

The previous prime is 111201223247. The next prime is 111201223307. The reversal of 111201223261 is 162322102111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111055562500 + 145660761 = 333250^2 + 12069^2 .

It is a cyclic number.

It is not a de Polignac number, because 111201223261 - 2⁵ = 111201223229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111201223961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55600611630 + 55600611631.

It is an arithmetic number, because the mean of its divisors is an integer number (55600611631).

Almost surely, 2^111201223261 is an apocalyptic number.

It is an amenable number.

111201223261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111201223261 is an equidigital number, since it uses as much as digits as its factorization.

111201223261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 111201223261 its reverse (162322102111), we get a palindrome (273523325372).

The spelling of 111201223261 in words is "one hundred eleven billion, two hundred one million, two hundred twenty-three thousand, two hundred sixty-one".