261340550 has 12 divisors (see below), whose sum is σ = 486093516. Its totient is φ = 104536200.

The previous prime is 261340549. The next prime is 261340553. The reversal of 261340550 is 55043162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261340553) 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 5 ways as a sum of consecutive naturals, for example, 2613356 + ... + 2613455.

It is an arithmetic number, because the mean of its divisors is an integer number (40507793).

Almost surely, 2^261340550 is an apocalyptic number.

261340550 is a deficient number, since it is larger than the sum of its proper divisors (224752966).

261340550 is a wasteful number, since it uses less digits than its factorization.

261340550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226823 (or 5226818 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 261340550 is about 16166.0307435066. The cubic root of 261340550 is about 639.3454815781.

The spelling of 261340550 in words is "two hundred sixty-one million, three hundred forty thousand, five hundred fifty".