261441539 has 4 divisors (see below), whose sum is σ = 275201640. Its totient is φ = 247681440.

The previous prime is 261441511. The next prime is 261441541. The reversal of 261441539 is 935144162.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261441539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261441499 and 261441508.

It is not an unprimeable number, because it can be changed into a prime (261441139) 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, 6880022 + ... + 6880059.

It is an arithmetic number, because the mean of its divisors is an integer number (68800410).

Almost surely, 2^261441539 is an apocalyptic number.

261441539 is a deficient number, since it is larger than the sum of its proper divisors (13760101).

261441539 is a wasteful number, since it uses less digits than its factorization.

261441539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13760100.

The product of its digits is 25920, while the sum is 35.

The square root of 261441539 is about 16169.1539358125. The cubic root of 261441539 is about 639.4278243882.

It can be divided in two parts, 26144153 and 9, that added together give a palindrome (26144162).

The spelling of 261441539 in words is "two hundred sixty-one million, four hundred forty-one thousand, five hundred thirty-nine".