261445411 has 4 divisors (see below), whose sum is σ = 270460800. Its totient is φ = 252430024.

The previous prime is 261445403. The next prime is 261445427. The reversal of 261445411 is 114544162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261445411 - 2³ = 261445403 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261445411.

It is not an unprimeable number, because it can be changed into a prime (261445711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4507651 + ... + 4507708.

It is an arithmetic number, because the mean of its divisors is an integer number (67615200).

Almost surely, 2^261445411 is an apocalyptic number.

261445411 is a deficient number, since it is larger than the sum of its proper divisors (9015389).

261445411 is an equidigital number, since it uses as much as digits as its factorization.

261445411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9015388.

The product of its digits is 3840, while the sum is 28.

The square root of 261445411 is about 16169.2736695252. The cubic root of 261445411 is about 639.4309810561.

Adding to 261445411 its reverse (114544162), we get a palindrome (375989573).

The spelling of 261445411 in words is "two hundred sixty-one million, four hundred forty-five thousand, four hundred eleven".