261200550 has 48 divisors (see below), whose sum is σ = 697611600. Its totient is φ = 64295040.

The previous prime is 261200531. The next prime is 261200561. The reversal of 261200550 is 55002162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65025 + ... + 68924.

It is an arithmetic number, because the mean of its divisors is an integer number (14533575).

Almost surely, 2^261200550 is an apocalyptic number.

261200550 is an abundant number, since it is smaller than the sum of its proper divisors (436411050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261200550 is a wasteful number, since it uses less digits than its factorization.

261200550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133977 (or 133972 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 261200550 is about 16161.7000962151. The cubic root of 261200550 is about 639.2312955026.

The spelling of 261200550 in words is "two hundred sixty-one million, two hundred thousand, five hundred fifty".