111523261 has 2 divisors, whose sum is σ = 111523262. Its totient is φ = 111523260.

The previous prime is 111523253. The next prime is 111523283. The reversal of 111523261 is 162325111.

It is a happy number.

It is an a-pointer prime, because the next prime (111523283) can be obtained adding 111523261 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81108036 + 30415225 = 9006^2 + 5515^2 .

It is a cyclic number.

It is not a de Polignac number, because 111523261 - 2³ = 111523253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111523361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55761630 + 55761631.

It is an arithmetic number, because the mean of its divisors is an integer number (55761631).

Almost surely, 2^111523261 is an apocalyptic number.

It is an amenable number.

111523261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111523261 is an equidigital number, since it uses as much as digits as its factorization.

111523261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 22.

The square root of 111523261 is about 10560.4574238051. The cubic root of 111523261 is about 481.3435463060.

Adding to 111523261 its reverse (162325111), we get a palindrome (273848372).

The spelling of 111523261 in words is "one hundred eleven million, five hundred twenty-three thousand, two hundred sixty-one".