1265861 has 2 divisors, whose sum is σ = 1265862. Its totient is φ = 1265860.

The previous prime is 1265857. The next prime is 1265863. The reversal of 1265861 is 1685621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 616225 = 806^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1265861 - 2² = 1265857 is a prime.

Together with 1265863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632930 + 632931.

It is an arithmetic number, because the mean of its divisors is an integer number (632931).

2^1265861 is an apocalyptic number.

It is an amenable number.

1265861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265861 is an equidigital number, since it uses as much as digits as its factorization.

1265861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 29.

The square root of 1265861 is about 1125.1048839997. The cubic root of 1265861 is about 108.1754407310.

The spelling of 1265861 in words is "one million, two hundred sixty-five thousand, eight hundred sixty-one".