261413 has 4 divisors (see below), whose sum is σ = 265068. Its totient is φ = 257760.

The previous prime is 261407. The next prime is 261427. The reversal of 261413 is 314162.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 314162 = 2 ⋅157081.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 66049 = 442^2 + 257^2 .

It is a cyclic number.

It is not a de Polignac number, because 261413 - 2¹⁴ = 245029 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261391 and 261400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (66267).

2²⁶¹⁴¹³ is an apocalyptic number.

It is an amenable number.

261413 is a deficient number, since it is larger than the sum of its proper divisors (3655).

261413 is an equidigital number, since it uses as much as digits as its factorization.

261413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654.

The product of its digits is 144, while the sum is 17.

The square root of 261413 is about 511.2856344549. The cubic root of 261413 is about 63.9404556861.

Adding to 261413 its reverse (314162), we get a palindrome (575575).

The spelling of 261413 in words is "two hundred sixty-one thousand, four hundred thirteen".