261150220 has 24 divisors (see below), whose sum is σ = 567327600. Its totient is φ = 100857792.

The previous prime is 261150179. The next prime is 261150319. The reversal of 261150220 is 22051162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224550 + ... + 225709.

It is an arithmetic number, because the mean of its divisors is an integer number (23638650).

Almost surely, 2^261150220 is an apocalyptic number.

261150220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261150220 is an abundant number, since it is smaller than the sum of its proper divisors (306177380).

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

261150220 is a wasteful number, since it uses less digits than its factorization.

261150220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450297 (or 450295 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 261150220 is about 16160.1429449123. The cubic root of 261150220 is about 639.1902356379.

The spelling of 261150220 in words is "two hundred sixty-one million, one hundred fifty thousand, two hundred twenty".