23111261 has 2 divisors, whose sum is σ = 23111262. Its totient is φ = 23111260.

The previous prime is 23111237. The next prime is 23111287. The reversal of 23111261 is 16211132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19802500 + 3308761 = 4450^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 23111261 - 2⁶ = 23111197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23117261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11555630 + 11555631.

It is an arithmetic number, because the mean of its divisors is an integer number (11555631).

Almost surely, 2^23111261 is an apocalyptic number.

It is an amenable number.

23111261 is a deficient number, since it is larger than the sum of its proper divisors (1).

23111261 is an equidigital number, since it uses as much as digits as its factorization.

23111261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 17.

The square root of 23111261 is about 4807.4172899801. The cubic root of 23111261 is about 284.8445279042.

Adding to 23111261 its reverse (16211132), we get a palindrome (39322393).

The spelling of 23111261 in words is "twenty-three million, one hundred eleven thousand, two hundred sixty-one".