261029 has 4 divisors (see below), whose sum is σ = 270060. Its totient is φ = 252000.

The previous prime is 261017. The next prime is 261031. The reversal of 261029 is 920162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 920162 = 2 ⋅460081.

It can be written as a sum of positive squares in 2 ways, for example, as 88804 + 172225 = 298^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 261029 - 2⁴ = 261013 is a prime.

It is a super-2 number, since 2×261029² = 136272277682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 261029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261059) 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, 4472 + ... + 4529.

It is an arithmetic number, because the mean of its divisors is an integer number (67515).

2²⁶¹⁰²⁹ is an apocalyptic number.

261029 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

261029 is a deficient number, since it is larger than the sum of its proper divisors (9031).

261029 is an equidigital number, since it uses as much as digits as its factorization.

261029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9030.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 261029 is about 510.9099725000. The cubic root of 261029 is about 63.9091321136.

The spelling of 261029 in words is "two hundred sixty-one thousand, twenty-nine".