261253441 has 4 divisors (see below), whose sum is σ = 261458352. Its totient is φ = 261048532.

The previous prime is 261253427. The next prime is 261253451. The reversal of 261253441 is 144352162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 144352162 = 2 ⋅72176081.

It is a cyclic number.

It is not a de Polignac number, because 261253441 - 2⁷ = 261253313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261253451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 100531 + ... + 103096.

It is an arithmetic number, because the mean of its divisors is an integer number (65364588).

Almost surely, 2^261253441 is an apocalyptic number.

It is an amenable number.

261253441 is a deficient number, since it is larger than the sum of its proper divisors (204911).

261253441 is a wasteful number, since it uses less digits than its factorization.

261253441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204910.

The product of its digits is 5760, while the sum is 28.

The square root of 261253441 is about 16163.3363202032. The cubic root of 261253441 is about 639.2744389807.

The spelling of 261253441 in words is "two hundred sixty-one million, two hundred fifty-three thousand, four hundred forty-one".