261271350 has 72 divisors (see below), whose sum is σ = 707168280. Its totient is φ = 69154560.

The previous prime is 261271331. The next prime is 261271399. The reversal of 261271350 is 53172162.

It is a happy number.

It is a Curzon number.

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 35 ways as a sum of consecutive naturals, for example, 60462 + ... + 64638.

Almost surely, 2^261271350 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261271350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353584140).

261271350 is an abundant number, since it is smaller than the sum of its proper divisors (445896930).

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

261271350 is a wasteful number, since it uses less digits than its factorization.

261271350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4334 (or 4326 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 261271350 is about 16163.8903114318. The cubic root of 261271350 is about 639.2890461304.

The spelling of 261271350 in words is "two hundred sixty-one million, two hundred seventy-one thousand, three hundred fifty".