1045239991 has 12 divisors (see below), whose sum is σ = 1095559360. Its totient is φ = 997143840.

The previous prime is 1045239959. The next prime is 1045239997. The reversal of 1045239991 is 1999325401.

It is not a de Polignac number, because 1045239991 - 2⁵ = 1045239959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045239997) 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 in 11 ways as a sum of consecutive naturals, for example, 213946 + ... + 218776.

Almost surely, 2^1045239991 is an apocalyptic number.

1045239991 is a deficient number, since it is larger than the sum of its proper divisors (50319369).

1045239991 is an equidigital number, since it uses as much as digits as its factorization.

1045239991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5286 (or 5263 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 1045239991 is about 32330.1715275376. The cubic root of 1045239991 is about 1014.8581393139.

The spelling of 1045239991 in words is "one billion, forty-five million, two hundred thirty-nine thousand, nine hundred ninety-one".