261248489 has 4 divisors (see below), whose sum is σ = 261282180. Its totient is φ = 261214800.

The previous prime is 261248483. The next prime is 261248509. The reversal of 261248489 is 984842162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 218803264 + 42445225 = 14792^2 + 6515^2 .

It is a cyclic number.

It is not a de Polignac number, because 261248489 - 2²⁰ = 260199913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261248483) 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, 1307 + ... + 22895.

It is an arithmetic number, because the mean of its divisors is an integer number (65320545).

Almost surely, 2^261248489 is an apocalyptic number.

It is an amenable number.

261248489 is a deficient number, since it is larger than the sum of its proper divisors (33691).

261248489 is a wasteful number, since it uses less digits than its factorization.

261248489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33690.

The product of its digits is 221184, while the sum is 44.

The square root of 261248489 is about 16163.1831332816. The cubic root of 261248489 is about 639.2703998543.

The spelling of 261248489 in words is "two hundred sixty-one million, two hundred forty-eight thousand, four hundred eighty-nine".