111430261 has 2 divisors, whose sum is σ = 111430262. Its totient is φ = 111430260.

The previous prime is 111430237. The next prime is 111430283. The reversal of 111430261 is 162034111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100500625 + 10929636 = 10025^2 + 3306^2 .

It is a cyclic number.

It is not a de Polignac number, because 111430261 - 2⁹ = 111429749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111431261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55715130 + 55715131.

It is an arithmetic number, because the mean of its divisors is an integer number (55715131).

Almost surely, 2^111430261 is an apocalyptic number.

It is an amenable number.

111430261 is a deficient number, since it is larger than the sum of its proper divisors (1).

111430261 is an equidigital number, since it uses as much as digits as its factorization.

111430261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 111430261 is about 10556.0532870955. The cubic root of 111430261 is about 481.2097105530.

Adding to 111430261 its reverse (162034111), we get a palindrome (273464372).

It can be divided in two parts, 1114 and 30261, that added together give a triangular number (31375 = T₂₅₀).

The spelling of 111430261 in words is "one hundred eleven million, four hundred thirty thousand, two hundred sixty-one".