261797045 has 4 divisors (see below), whose sum is σ = 314156460. Its totient is φ = 209437632.

The previous prime is 261797033. The next prime is 261797069. The reversal of 261797045 is 540797162.

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 36857041 + 224940004 = 6071^2 + 14998^2 .

It is a cyclic number.

It is not a de Polignac number, because 261797045 - 2²⁰ = 260748469 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261796993 and 261797011.

It is a congruent number.

It is an unprimeable number.

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, 26179700 + ... + 26179709.

It is an arithmetic number, because the mean of its divisors is an integer number (78539115).

Almost surely, 2^261797045 is an apocalyptic number.

It is an amenable number.

261797045 is a deficient number, since it is larger than the sum of its proper divisors (52359415).

261797045 is an equidigital number, since it uses as much as digits as its factorization.

261797045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52359414.

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 261797045 is about 16180.1435407724. The cubic root of 261797045 is about 639.7175226392.

The spelling of 261797045 in words is "two hundred sixty-one million, seven hundred ninety-seven thousand, forty-five".