261142 has 16 divisors (see below), whose sum is σ = 467712. Its totient is φ = 106920.

The previous prime is 261127. The next prime is 261167. The reversal of 261142 is 241162.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84 + ... + 727.

It is an arithmetic number, because the mean of its divisors is an integer number (29232).

2²⁶¹¹⁴² is an apocalyptic number.

261142 is a deficient number, since it is larger than the sum of its proper divisors (206570).

261142 is a wasteful number, since it uses less digits than its factorization.

261142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843.

The product of its digits is 96, while the sum is 16.

The square root of 261142 is about 511.0205475321. The cubic root of 261142 is about 63.9183529154.

It can be divided in two parts, 26 and 1142, that multiplied together give a palindrome (29692).

The spelling of 261142 in words is "two hundred sixty-one thousand, one hundred forty-two".