1139491 has 2 divisors, whose sum is σ = 1139492. Its totient is φ = 1139490.

The previous prime is 1139483. The next prime is 1139503. The reversal of 1139491 is 1949311.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1139491 - 2³ = 1139483 is a prime.

It is not a weakly prime, because it can be changed into another prime (1139461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569745 + 569746.

It is an arithmetic number, because the mean of its divisors is an integer number (569746).

2^1139491 is an apocalyptic number.

1139491 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139491 is an equidigital number, since it uses as much as digits as its factorization.

1139491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 972, while the sum is 28.

The square root of 1139491 is about 1067.4694375016. The cubic root of 1139491 is about 104.4488428894.

It can be divided in two parts, 113 and 9491, that added together give a square (9604 = 98²).

The spelling of 1139491 in words is "one million, one hundred thirty-nine thousand, four hundred ninety-one".