261846045 has 24 divisors (see below), whose sum is σ = 457190136. Its totient is φ = 138628608.

The previous prime is 261846041. The next prime is 261846047. The reversal of 261846045 is 540648162.

It can be written as a sum of positive squares in 4 ways, for example, as 8749764 + 253096281 = 2958^2 + 15909^2 .

It is not a de Polignac number, because 261846045 - 2² = 261846041 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261846041) 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 23 ways as a sum of consecutive naturals, for example, 15072 + ... + 27401.

It is an arithmetic number, because the mean of its divisors is an integer number (19049589).

Almost surely, 2^261846045 is an apocalyptic number.

It is an amenable number.

261846045 is a deficient number, since it is larger than the sum of its proper divisors (195344091).

261846045 is a wasteful number, since it uses less digits than its factorization.

261846045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42621 (or 42618 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 261846045 is about 16181.6576715737. The cubic root of 261846045 is about 639.7574316753.

The spelling of 261846045 in words is "two hundred sixty-one million, eight hundred forty-six thousand, forty-five".