261101 has 2 divisors, whose sum is σ = 261102. Its totient is φ = 261100.

The previous prime is 261089. The next prime is 261127. The reversal of 261101 is 101162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249001 + 12100 = 499^2 + 110^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261101 is a prime.

It is a Chen prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 261101.

It is not a weakly prime, because it can be changed into another prime (261301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130550 + 130551.

It is an arithmetic number, because the mean of its divisors is an integer number (130551).

2²⁶¹¹⁰¹ is an apocalyptic number.

It is an amenable number.

261101 is a deficient number, since it is larger than the sum of its proper divisors (1).

261101 is an equidigital number, since it uses as much as digits as its factorization.

261101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 261101 is about 510.9804301536. The cubic root of 261101 is about 63.9150076223.

Adding to 261101 its reverse (101162), we get a palindrome (362263).

The spelling of 261101 in words is "two hundred sixty-one thousand, one hundred one".