261073 has 4 divisors (see below), whose sum is σ = 272448. Its totient is φ = 249700.

The previous prime is 261071. The next prime is 261077. The reversal of 261073 is 370162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261073 - 2¹ = 261071 is a prime.

It is a super-2 number, since 2×261073² = 136318222658, which contains 22 as substring.

It is a Duffinian number.

261073 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 261073.

It is not an unprimeable number, because it can be changed into a prime (261071) 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, 5653 + ... + 5698.

It is an arithmetic number, because the mean of its divisors is an integer number (68112).

2²⁶¹⁰⁷³ is an apocalyptic number.

261073 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

261073 is a deficient number, since it is larger than the sum of its proper divisors (11375).

261073 is a wasteful number, since it uses less digits than its factorization.

261073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 261073 is about 510.9530311095. The cubic root of 261073 is about 63.9127228306.

It can be divided in two parts, 2 and 61073, that added together give a triangular number (61075 = T₃₄₉).

The spelling of 261073 in words is "two hundred sixty-one thousand, seventy-three".