1038634991 has 2 divisors, whose sum is σ = 1038634992. Its totient is φ = 1038634990.

The previous prime is 1038634963. The next prime is 1038635071. The reversal of 1038634991 is 1994368301.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1038634991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1038634921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 519317495 + 519317496.

It is an arithmetic number, because the mean of its divisors is an integer number (519317496).

Almost surely, 2^1038634991 is an apocalyptic number.

1038634991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1038634991 is an equidigital number, since it uses as much as digits as its factorization.

1038634991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 1038634991 is about 32227.8604781639. The cubic root of 1038634991 is about 1012.7159495893.

The spelling of 1038634991 in words is "one billion, thirty-eight million, six hundred thirty-four thousand, nine hundred ninety-one".