261471650 has 24 divisors (see below), whose sum is σ = 530550864. Its totient is φ = 95080400.

The previous prime is 261471647. The next prime is 261471653. The reversal of 261471650 is 56174162.

It is an interprime number because it is at equal distance from previous prime (261471647) and next prime (261471653).

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (261471653) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 237152 + ... + 238251.

It is an arithmetic number, because the mean of its divisors is an integer number (22106286).

Almost surely, 2^261471650 is an apocalyptic number.

261471650 is an abundant number, since it is smaller than the sum of its proper divisors (269079214).

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

261471650 is a wasteful number, since it uses less digits than its factorization.

261471650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475426 (or 475421 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 261471650 is about 16170.0850337900. The cubic root of 261471650 is about 639.4523717143.

The spelling of 261471650 in words is "two hundred sixty-one million, four hundred seventy-one thousand, six hundred fifty".