1139861 has 2 divisors, whose sum is σ = 1139862. Its totient is φ = 1139860.

The previous prime is 1139851. The next prime is 1139863. The reversal of 1139861 is 1689311.

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., 1060900 + 78961 = 1030^2 + 281^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139861 - 2¹⁴ = 1123477 is a prime.

Together with 1139863, 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 (1139863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569930 + 569931.

It is an arithmetic number, because the mean of its divisors is an integer number (569931).

2^1139861 is an apocalyptic number.

It is an amenable number.

1139861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139861 is an equidigital number, since it uses as much as digits as its factorization.

1139861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 1139861 is about 1067.6427305049. The cubic root of 1139861 is about 104.4601467346.

The spelling of 1139861 in words is "one million, one hundred thirty-nine thousand, eight hundred sixty-one".