261244411 has 2 divisors, whose sum is σ = 261244412. Its totient is φ = 261244410.

The previous prime is 261244397. The next prime is 261244421. The reversal of 261244411 is 114442162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261244411 - 2¹³ = 261236219 is a prime.

It is not a weakly prime, because it can be changed into another prime (261244421) 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, 130622205 + 130622206.

It is an arithmetic number, because the mean of its divisors is an integer number (130622206).

Almost surely, 2^261244411 is an apocalyptic number.

261244411 is a deficient number, since it is larger than the sum of its proper divisors (1).

261244411 is an equidigital number, since it uses as much as digits as its factorization.

261244411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1536, while the sum is 25.

The square root of 261244411 is about 16163.0569818955. The cubic root of 261244411 is about 639.2670735725.

Adding to 261244411 its reverse (114442162), we get a palindrome (375686573).

The spelling of 261244411 in words is "two hundred sixty-one million, two hundred forty-four thousand, four hundred eleven".