1024438991 has 4 divisors (see below), whose sum is σ = 1024765632. Its totient is φ = 1024112352.

The previous prime is 1024438963. The next prime is 1024438993. The reversal of 1024438991 is 1998344201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1024438991 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 (1024438993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158570 + ... + 164903.

It is an arithmetic number, because the mean of its divisors is an integer number (256191408).

Almost surely, 2^1024438991 is an apocalyptic number.

1024438991 is a deficient number, since it is larger than the sum of its proper divisors (326641).

1024438991 is an equidigital number, since it uses as much as digits as its factorization.

1024438991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326640.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 1024438991 is about 32006.8584993904. The cubic root of 1024438991 is about 1008.0808542344.

The spelling of 1024438991 in words is "one billion, twenty-four million, four hundred thirty-eight thousand, nine hundred ninety-one".