261335411 has 4 divisors (see below), whose sum is σ = 263872752. Its totient is φ = 258798072.

The previous prime is 261335359. The next prime is 261335413. The reversal of 261335411 is 114533162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 114533162 = 2 ⋅57266581.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261335411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261335413) 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, 1268516 + ... + 1268721.

It is an arithmetic number, because the mean of its divisors is an integer number (65968188).

Almost surely, 2^261335411 is an apocalyptic number.

261335411 is a deficient number, since it is larger than the sum of its proper divisors (2537341).

261335411 is a wasteful number, since it uses less digits than its factorization.

261335411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2537340.

The product of its digits is 2160, while the sum is 26.

The square root of 261335411 is about 16165.8717983287. The cubic root of 261335411 is about 639.3412908546.

Adding to 261335411 its reverse (114533162), we get a palindrome (375868573).

The spelling of 261335411 in words is "two hundred sixty-one million, three hundred thirty-five thousand, four hundred eleven".