261327172 has 24 divisors (see below), whose sum is σ = 465720192. Its totient is φ = 128272800.

The previous prime is 261327169. The next prime is 261327193. The reversal of 261327172 is 271723162.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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, 236373 + ... + 237475.

It is an arithmetic number, because the mean of its divisors is an integer number (19405008).

Almost surely, 2^261327172 is an apocalyptic number.

It is an amenable number.

261327172 is a deficient number, since it is larger than the sum of its proper divisors (204393020).

261327172 is a wasteful number, since it uses less digits than its factorization.

261327172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139 (or 2137 counting only the distinct ones).

The product of its digits is 7056, while the sum is 31.

The square root of 261327172 is about 16165.6169693581. The cubic root of 261327172 is about 639.3345720455.

The spelling of 261327172 in words is "two hundred sixty-one million, three hundred twenty-seven thousand, one hundred seventy-two".