261350871 has 32 divisors (see below), whose sum is σ = 381696000. Its totient is φ = 158433408.

The previous prime is 261350849. The next prime is 261350891. The reversal of 261350871 is 178053162.

It is not a de Polignac number, because 261350871 - 2⁷ = 261350743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261350821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368265 + ... + 368973.

It is an arithmetic number, because the mean of its divisors is an integer number (11928000).

Almost surely, 2^261350871 is an apocalyptic number.

261350871 is a deficient number, since it is larger than the sum of its proper divisors (120345129).

261350871 is a wasteful number, since it uses less digits than its factorization.

261350871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983.

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 261350871 is about 16166.3499590971. The cubic root of 261350871 is about 639.3538979246.

The spelling of 261350871 in words is "two hundred sixty-one million, three hundred fifty thousand, eight hundred seventy-one".