261111112 has 8 divisors (see below), whose sum is σ = 489583350. Its totient is φ = 130555552.

The previous prime is 261111107. The next prime is 261111113. The reversal of 261111112 is 211111162.

It can be written as a sum of positive squares in only one way, i.e., 248819076 + 12292036 = 15774^2 + 3506^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261111113) 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, 16319437 + ... + 16319452.

Almost surely, 2^261111112 is an apocalyptic number.

It is an amenable number.

261111112 is a deficient number, since it is larger than the sum of its proper divisors (228472238).

261111112 is a wasteful number, since it uses less digits than its factorization.

261111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32638895 (or 32638891 counting only the distinct ones).

The product of its digits is 24, while the sum is 16.

The square root of 261111112 is about 16158.9328855590. The cubic root of 261111112 is about 639.1583271835.

Adding to 261111112 its reverse (211111162), we get a palindrome (472222274).

The spelling of 261111112 in words is "two hundred sixty-one million, one hundred eleven thousand, one hundred twelve".