938874991 has 2 divisors, whose sum is σ = 938874992. Its totient is φ = 938874990.

The previous prime is 938874983. The next prime is 938875051. The reversal of 938874991 is 199478839.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 938874991 - 2³ = 938874983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (938874901) 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 as a sum of consecutive naturals, namely, 469437495 + 469437496.

It is an arithmetic number, because the mean of its divisors is an integer number (469437496).

Almost surely, 2^938874991 is an apocalyptic number.

938874991 is a deficient number, since it is larger than the sum of its proper divisors (1).

938874991 is an equidigital number, since it uses as much as digits as its factorization.

938874991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3919104, while the sum is 58.

The square root of 938874991 is about 30641.0670669283. The cubic root of 938874991 is about 979.1951572512.

The spelling of 938874991 in words is "nine hundred thirty-eight million, eight hundred seventy-four thousand, nine hundred ninety-one".