1040639191 has 2 divisors, whose sum is σ = 1040639192. Its totient is φ = 1040639190.

The previous prime is 1040639147. The next prime is 1040639203. The reversal of 1040639191 is 1919360401.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1040639191 - 2⁹ = 1040638679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040639111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520319595 + 520319596.

It is an arithmetic number, because the mean of its divisors is an integer number (520319596).

Almost surely, 2^1040639191 is an apocalyptic number.

1040639191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040639191 is an equidigital number, since it uses as much as digits as its factorization.

1040639191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1040639191 is about 32258.9397066922. The cubic root of 1040639191 is about 1013.3669261741.

Adding to 1040639191 its reverse (1919360401), we get a palindrome (2959999592).

The spelling of 1040639191 in words is "one billion, forty million, six hundred thirty-nine thousand, one hundred ninety-one".