261872150 has 36 divisors (see below), whose sum is σ = 499841892. Its totient is φ = 102019680.

The previous prime is 261872147. The next prime is 261872179. The reversal of 261872150 is 51278162.

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, 750176 + ... + 750524.

It is an arithmetic number, because the mean of its divisors is an integer number (13884497).

Almost surely, 2^261872150 is an apocalyptic number.

261872150 is a deficient number, since it is larger than the sum of its proper divisors (237969742).

261872150 is an equidigital number, since it uses as much as digits as its factorization.

261872150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 399 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 261872150 is about 16182.4642746400. The cubic root of 261872150 is about 639.7786913851.

The spelling of 261872150 in words is "two hundred sixty-one million, eight hundred seventy-two thousand, one hundred fifty".