260437561 has 4 divisors (see below), whose sum is σ = 267476452. Its totient is φ = 253398672.

The previous prime is 260437553. The next prime is 260437571. The reversal of 260437561 is 165734062.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 183331600 + 77105961 = 13540^2 + 8781^2 .

It is a cyclic number.

It is not a de Polignac number, because 260437561 - 2³ = 260437553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (260437571) 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 3 ways as a sum of consecutive naturals, for example, 3519390 + ... + 3519463.

It is an arithmetic number, because the mean of its divisors is an integer number (66869113).

Almost surely, 2^260437561 is an apocalyptic number.

It is an amenable number.

260437561 is a deficient number, since it is larger than the sum of its proper divisors (7038891).

260437561 is an equidigital number, since it uses as much as digits as its factorization.

260437561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7038890.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 260437561 is about 16138.0779834527. The cubic root of 260437561 is about 638.6082721642.

The spelling of 260437561 in words is "two hundred sixty million, four hundred thirty-seven thousand, five hundred sixty-one".