261151 has 4 divisors (see below), whose sum is σ = 284904. Its totient is φ = 237400.

The previous prime is 261127. The next prime is 261167. The reversal of 261151 is 151162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261151 - 2¹⁵ = 228383 is a prime.

It is a Duffinian number.

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 (261101) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11860 + ... + 11881.

It is an arithmetic number, because the mean of its divisors is an integer number (71226).

2²⁶¹¹⁵¹ is an apocalyptic number.

261151 is a deficient number, since it is larger than the sum of its proper divisors (23753).

261151 is a wasteful number, since it uses less digits than its factorization.

261151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23752.

The product of its digits is 60, while the sum is 16.

The square root of 261151 is about 511.0293533644. The cubic root of 261151 is about 63.9190872012.

It can be divided in two parts, 2611 and 51, that added together give a palindrome (2662).

The spelling of 261151 in words is "two hundred sixty-one thousand, one hundred fifty-one".