261143411 has 16 divisors (see below), whose sum is σ = 275294208. Its totient is φ = 247406400.

The previous prime is 261143401. The next prime is 261143417. The reversal of 261143411 is 114341162.

It is a cyclic number.

It is not a de Polignac number, because 261143411 - 2²² = 256949107 is a prime.

It is a super-2 number, since 2×261143411² = 136391762217429842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261143417) 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 15 ways as a sum of consecutive naturals, for example, 377576 + ... + 378266.

It is an arithmetic number, because the mean of its divisors is an integer number (17205888).

Almost surely, 2^261143411 is an apocalyptic number.

261143411 is a deficient number, since it is larger than the sum of its proper divisors (14150797).

261143411 is a wasteful number, since it uses less digits than its factorization.

261143411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962.

The product of its digits is 576, while the sum is 23.

The square root of 261143411 is about 16159.9322708977. The cubic root of 261143411 is about 639.1846803625.

Adding to 261143411 its reverse (114341162), we get a palindrome (375484573).

The spelling of 261143411 in words is "two hundred sixty-one million, one hundred forty-three thousand, four hundred eleven".