261011213 has 4 divisors (see below), whose sum is σ = 261055680. Its totient is φ = 260966748.

The previous prime is 261011203. The next prime is 261011243. The reversal of 261011213 is 312110162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261011213 - 2⁸ = 261010957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261011191 and 261011200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261011203) 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 in 3 ways as a sum of consecutive naturals, for example, 11795 + ... + 25712.

It is an arithmetic number, because the mean of its divisors is an integer number (65263920).

Almost surely, 2^261011213 is an apocalyptic number.

It is an amenable number.

261011213 is a deficient number, since it is larger than the sum of its proper divisors (44467).

261011213 is an equidigital number, since it uses as much as digits as its factorization.

261011213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44466.

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

The square root of 261011213 is about 16155.8414513141. The cubic root of 261011213 is about 639.0768045168.

Adding to 261011213 its reverse (312110162), we get a palindrome (573121375).

The spelling of 261011213 in words is "two hundred sixty-one million, eleven thousand, two hundred thirteen".