1138831 has 2 divisors, whose sum is σ = 1138832. Its totient is φ = 1138830.

The previous prime is 1138829. The next prime is 1138849. The reversal of 1138831 is 1388311.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1138831 - 2¹ = 1138829 is a prime.

It is a super-3 number, since 3×1138831³ = 4430972924523330573, which contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 1138829, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1138796 and 1138805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1135831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569415 + 569416.

It is an arithmetic number, because the mean of its divisors is an integer number (569416).

2^1138831 is an apocalyptic number.

1138831 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138831 is an equidigital number, since it uses as much as digits as its factorization.

1138831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 1138831 is about 1067.1602503842. The cubic root of 1138831 is about 104.4286731967.

The spelling of 1138831 in words is "one million, one hundred thirty-eight thousand, eight hundred thirty-one".