1129861 has 2 divisors, whose sum is σ = 1129862. Its totient is φ = 1129860.

The previous prime is 1129859. The next prime is 1129889. The reversal of 1129861 is 1689211.

It is a happy number.

It is an a-pointer prime, because the next prime (1129889) can be obtained adding 1129861 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 799236 + 330625 = 894^2 + 575^2 .

It is an emirp because it is prime and its reverse (1689211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1129861 - 2¹ = 1129859 is a prime.

Together with 1129859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1129831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564930 + 564931.

It is an arithmetic number, because the mean of its divisors is an integer number (564931).

2^1129861 is an apocalyptic number.

It is an amenable number.

1129861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1129861 is an equidigital number, since it uses as much as digits as its factorization.

1129861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 28.

The square root of 1129861 is about 1062.9491991624. The cubic root of 1129861 is about 104.1537727685.

The spelling of 1129861 in words is "one million, one hundred twenty-nine thousand, eight hundred sixty-one".