261351 has 12 divisors (see below), whose sum is σ = 383760. Its totient is φ = 171360.

The previous prime is 261347. The next prime is 261353. The reversal of 261351 is 153162.

261351 is a `hidden beast` number, since 2 + 613 + 51 = 666.

It is not a de Polignac number, because 261351 - 2² = 261347 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 435 + ... + 843.

It is an arithmetic number, because the mean of its divisors is an integer number (31980).

2²⁶¹³⁵¹ is an apocalyptic number.

261351 is a deficient number, since it is larger than the sum of its proper divisors (122409).

261351 is a wasteful number, since it uses less digits than its factorization.

261351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486 (or 483 counting only the distinct ones).

The product of its digits is 180, while the sum is 18.

The square root of 261351 is about 511.2249993887. The cubic root of 261351 is about 63.9354003117.

The spelling of 261351 in words is "two hundred sixty-one thousand, three hundred fifty-one".