261413550 has 36 divisors (see below), whose sum is σ = 702332280. Its totient is φ = 69710160.

The previous prime is 261413527. The next prime is 261413587. The reversal of 261413550 is 55314162.

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 17 ways as a sum of consecutive naturals, for example, 290010 + ... + 290909.

It is an arithmetic number, because the mean of its divisors is an integer number (19509230).

Almost surely, 2^261413550 is an apocalyptic number.

261413550 is an abundant number, since it is smaller than the sum of its proper divisors (440918730).

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

261413550 is a wasteful number, since it uses less digits than its factorization.

261413550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580937 (or 580929 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261413550 is about 16168.2884066310. The cubic root of 261413550 is about 639.4050052854.

The spelling of 261413550 in words is "two hundred sixty-one million, four hundred thirteen thousand, five hundred fifty".