261341231 has 2 divisors, whose sum is σ = 261341232. Its totient is φ = 261341230.

The previous prime is 261341189. The next prime is 261341299. The reversal of 261341231 is 132143162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261341231 - 2⁶ = 261341167 is a prime.

It is a super-2 number, since 2×261341231² = 136598478041190722, which contains 22 as substring.

It is a Chen prime.

It is equal to p_14265113 and since 261341231 and 14265113 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 261341197 and 261341206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261311231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130670615 + 130670616.

It is an arithmetic number, because the mean of its divisors is an integer number (130670616).

Almost surely, 2^261341231 is an apocalyptic number.

261341231 is a deficient number, since it is larger than the sum of its proper divisors (1).

261341231 is an equidigital number, since it uses as much as digits as its factorization.

261341231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 23.

The square root of 261341231 is about 16166.0518061770. The cubic root of 261341231 is about 639.3460369122.

Adding to 261341231 its reverse (132143162), we get a palindrome (393484393).

The spelling of 261341231 in words is "two hundred sixty-one million, three hundred forty-one thousand, two hundred thirty-one".