1261261 has 2 divisors, whose sum is σ = 1261262. Its totient is φ = 1261260.

The previous prime is 1261259. The next prime is 1261279. The reversal of 1261261 is 1621621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1223236 + 38025 = 1106^2 + 195^2 .

It is an emirp because it is prime and its reverse (1621621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1261261 - 2¹ = 1261259 is a prime.

Together with 1261259, it forms a pair of twin primes.

It is a Chen prime.

1261261 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261861) 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 as a sum of consecutive naturals, namely, 630630 + 630631.

It is an arithmetic number, because the mean of its divisors is an integer number (630631).

2^1261261 is an apocalyptic number.

It is an amenable number.

1261261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261261 is an equidigital number, since it uses as much as digits as its factorization.

1261261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 1261261 is about 1123.0587696109. The cubic root of 1261261 is about 108.0442491291.

Adding to 1261261 its reverse (1621621), we get a palindrome (2882882).

The spelling of 1261261 in words is "one million, two hundred sixty-one thousand, two hundred sixty-one".