1143391 has 2 divisors, whose sum is σ = 1143392. Its totient is φ = 1143390.

The previous prime is 1143371. The next prime is 1143407. The reversal of 1143391 is 1933411.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1143391 is a prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1143341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 571695 + 571696.

It is an arithmetic number, because the mean of its divisors is an integer number (571696).

2^1143391 is an apocalyptic number.

1143391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1143391 is an equidigital number, since it uses as much as digits as its factorization.

1143391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 22.

The square root of 1143391 is about 1069.2946273128. The cubic root of 1143391 is about 104.5678687348.

It can be divided in two parts, 11433 and 91, that multiplied together give a triangular number (1040403 = T₁₄₄₂).

The spelling of 1143391 in words is "one million, one hundred forty-three thousand, three hundred ninety-one".